Abstract: Molded plastic fuel containers comprise a plastic, with a pair of sides and gently inclined, integral front and rear faces. An integral handle spanning the top of the body extends over and between front and rear faces. A channel-like trough is defined at the bottom, beneath spaced-apart bottom portions. The trough is configured to snugly receive a handle when units are stacked vertically. Front portions of the handles and each trough are wider than corresponding rears. When a handle mated to and seated within a trough during stacking, stability is increased because both lateral (i.e., side-to-side) movements and linear (i.e., forward and rearward) movements are resisted by the locking action of the mating process.

Abstract: A plurality of cartons, preferably fabricated from paper, paperboard and/or corrugated paperboard, and particularly of tray or wrapper-style construction, are provided, having integral lid constructions, and outer overlap panels, operably associated with the at least one top panel, to enable articulation of the carton into a substantially completed structure, without interfering with the subsequent articulation of the at least one top panel to enable loading of the carton subsequent to articulation and affixation of the outer overlap panels.

Abstract: An apparatus and an associated method for receiving and positioning a plurality of spaced-apart power semiconductor modules using a molded positioning body. The molded positioning body has a planar first main face and a plurality of receptacles for receiving the power semiconductor modules therein. Each receptacle has a stop means, by which a main face of each power semiconductor module is positioned plane-parallel with one another and in alignment with the first main face of the molded positioning body. The receptacle is embodied as tapering inwardly in the direction of the first main face, beginning at the second main face.

Abstract: A cable reel for holding a cable wound thereon that includes a cylindrical drum having a longitudinal axis, a first end, and a second end spaced from the first end. The cable reel also includes a first flange that is coupled to the first end of the cylindrical drum and a second flange that is coupled to the second end of the cylindrical drum. The cable reel further includes a spacer that extends axially outward from the first flange. The spacer is configured to support the reel with the first flange spaced above a support surface when the longitudinal axis of the reel is in a substantially vertical orientation and with the reel being supported on the support surface by the spacer.

Abstract: A blank of sheet material for forming a polygonal container is provided. The blank includes a bottom panel, two opposing end panels each extending from an end edge of the bottom panel, two opposing outer side panels each extending from a side edge of the bottom panel, and an inner side panel extending from each top edge of one outer side panel of the two outer side panels. Each inner side panel includes a central portion, a corner portion extending from each side of the central portion, an inner end portion extending from each side of one of the corner portions, and a plurality of elongated relief cutouts. One elongated relief cutout of the plurality of elongated relief cutouts is defined between each corner portion and the central portion and between each inner end portion and an adjacent corner portion.

Abstract: A medical instrument sterilization system and method is provided. The system includes a sterilization container having a first container portion engagable with a second container portion to enclose an interior compartment from an exterior atmosphere. At least one insert is locatable within the interior compartment of the sterilization container, the at least one insert having a medical instrument holding area surrounded by a plurality of sidewalls, wherein the medical instrument holding area is sized to hold at least one medical instrument. A filter is secured within a wall of the first container portion, wherein the filter is in communication with the interior compartment and the exterior atmosphere.

Abstract: Container with a bottom wall, two side walls, and a back wall connecting them, and at least one drawer which can be pulled from the opening of the container, opposite this back wall, wherein on the upper edges of the two side walls, at least one locking device is provided. Such known containers are not flexible enough for practical use. The goal of refining a generic container in such a way that there are more combination possibilities in handling is attained in that the upper side of the container, opposite the bottom wall, is open and another container or a lid, covering the open upper side, can be optionally locked in via the locking device.

Abstract: An improved container provides a container body and a closure. In some embodiments, a scooping utensil retainer is disposed on the closure. The scooping utensil retainer includes opposing flanges protruding from the closure surface. A flange rib protrudes from the first flange into the flange gap, extending from the closure surface to the distal end of the flange. A tapered retainer gap is provided between flanges for resiliently clamping the handle of a scooping utensil. In some embodiments, the closure can include an annular ridge shaped for engaging a downwardly extending skirt on a like container when two like containers are vertically stacked. In some embodiments the container body includes an in-mold label affixed to a substantially straight side wall, the in-mold label covering at least about 95% of the exterior surface area of the container body.

Abstract: An improved drinking can enables a user to have fluid return into the can after drinking The improved drinking can comprises a can body comprising a contoured bottom edge immediately adjacent to a bottom recess. The can body further comprising a can top mechanically coupled to a spout. Where the spout is shaped to funnel fluid back into the can body. The bottom recess is shaped to enable a first improved drinking can to sit upon a second improved drinking can where bottom recess covers can top. This protects the drinking area from becoming contaminated during shipment, storage, and display. The can body is covered with a mural where the mural is covered by a mural cover comprising a tab such that the mural cover can be removed by applying force to the tab displaying the mural.

Abstract: The invention relates to a transport container comprising a rectangular base, with feet located at the underside thereof, with side walls that can pivot about hinges and that rise from said base, wherein the side walls, which lie on top in the folded-together state, and the bordering base edge comprising the hinges form support surfaces for the feet of an identical second container, the feet thereof being located below the base, characterized in that recesses are provided in the left and the right side area of the side walls, which lie on top in the folded-together state, the recesses being separated from one another by ribs and being used to receive protrusions formed on the bottom side of the feet, the height of the protrusions being less than the depth of the recesses.

Abstract: A stackable tray is provided that includes a tray having a bottom, a pair of side walls each having an upper edge, and a rear wall. A pair of support columns is provided on each side wall. Each of the support columns includes: a protrusion extending upwardly from a top portion of the support column; a first groove formed in a bottom portion of the support column, the first groove being aligned with the protrusion in the vertical direction; and a second groove formed in the bottom portion of the support column, the second groove being aligned with the upper edge of the respective side wall in the vertical direction.

Abstract: The present invention provides a module used for stacking thin panels that allows for stacking of a plurality of thin panels in the vertical direction efficiently and stably. The module includes a sandwiching support portion, a load transmitting portion, and a positioning portion. The sandwiching support portion sandwiches and supports the thin panel. The load transmitting portion is coupled with the sandwiching support portion, and transmits the weight of the thin panel in the vertical direction. The positioning portion relatively positions thin panels, which are stacked in the vertical direction, in the horizontal direction. The sandwiching support portion includes a lower plate-shaped body and a vertical wall. The lower plate-shaped body is disposed on a lower portion of the module. The vertical wall extends upward from an outer edge of the lower plate-shaped body to form an approximately C-shaped cross-sectional surface in conjunction with the lower plate-shaped body.

Abstract: A carry out food bowl comprising a bowl and a removable cover. The bowl includes a conversion demarcation, which defines a conversion section. The conversion section includes a portion of a sidewall of the bowl and a bottom portion of the bowl. The user would depress the conversion section inward creating a new bowl support surface, wherein the new support surface tilts an opening of the bowl. A condiment container receptacle can be integrated into the cover to retain a condiment container assembly. This associates the condiment with the contents of the bowl. The bowl and lid can include a stacking interface enabling one to attach a second bowl onto a cover of a first bowl.

Abstract: Universal wraps are used in the construction of a container centerbody. The wraps may take the form of a top and bottom wrap with complementary stacking patterns, in which the wraps create the centerbody. The wraps permit stacking of different-style containers regardless of which container is positioned as the bottom container. The universal wraps may include curved edge portions to seamlessly and aesthetically blend in with a side panel of the container. The stacking patterns of the wraps may take different forms with various shaped protuberances and recessed portions. Further, one or more of the wraps may have isolation features attached to or integrally formed with an interior surface of the wrap.

Abstract: A food container includes a base and a lid, and the lid may have a recess configured to receive a second container. The base may comprise a formed cavity that provides a bowl into which food or other items may be placed. The recess in the lid may receive a cup containing another item, such as a condiment or topping. The cup with the condiment or topping may be inserted into the recess, and removed from the recess, without removing the lid from the base. The lid and/or the base may be formed from any suitable materials, such as a transparent or non-transparent plastic material, and/or a compostable material.

Abstract: A plastic container with a rim and a lid, the rim and lid each having channels which, upon installation, produce a liquid-tight fit by means of three complementary pairs of projections from the walls of the channels.

Abstract: A box for receiving a food item is provided, and the box is usable with an additional box that is also configured to receive a food item. The box includes a bottom portion, and a top portion that is hingedly connected to the bottom portion and that forms a cover. The top portion includes a top panel and a side panel connected to the top panel, and the side panel has a bendable tab formed therein. The tab is bendable to an operative position and cooperable with the additional box to link the two boxes together when the additional box is placed on top of the box.

Abstract: A box for receiving a food item is provided, and the box is usable with an additional box that is also configured to receive a food item. The box includes a bottom portion including a bottom panel having a link feature formed therein, and a top portion hingedly connected to the bottom portion and configured to form a cover. The top portion includes a top panel having a link feature formed therein. The link feature of the bottom portion is cooperable with the additional box to link the two boxes together when the additional box is placed beneath the box, or the link feature of the top portion is cooperable with the additional box to link the two boxes together when the additional box is placed on top of the box. Furthermore, at least one of the link features comprises a bendable tab.

Abstract: In one embodiment, a dishwasher rack includes: an interior structure divided into separate compartments, each sized and configured to hold an individual beverage container; a top side through which the compartments may be loaded; a bottom side having a support surface; and a release mechanism. The top and/or bottom side has a configurable surface that provides a closed configuration in which it is capable of supporting beverage containers and an open configuration in which beverage containers are able to pass through. When the dishwasher rack is placed on top of a desired exterior surface with the configurable surface immediately adjacent to the exterior surface, the release mechanism can be operated to change the configurable surface from the closed configuration to the open configuration, causing any enclosed beverage containers to drop down onto the exterior surface and remain there when the dishwasher rack is lifted up and away.

Abstract: Storage container systems include a plurality of containers and a plurality of lids for sealing the containers. The container systems have a plurality of differently sized containers that are configured in modular sizes such that the containers can he stacked together in compact arrangements. The lids can easily he positioned on the containers to create a tight seals to the containers. When the containers are not sealed with the lids, the containers may be nested together, and the lids may be nested together. When nested together, the containers and lids take up a minimal amount of space.

Abstract: A packaging box, cutouts, method and device for producing corrugated cardboard boxes comprising walls, a base (6) and a cover (7), the inner face of the base being provided with at least two recesses (33) and the cover comprising at least two tabs (38) adhered to the upper face thereof, directly above the recesses of complementary shape. The recesses and/or the tabs are situated fully inside the corresponding face or faces (31, 32).

Abstract: The present invention pertains to a stackable packaging unit (1) for the packaging of products (100), the said packaging unit (1) comprising at least one encircling wall (2) provided at least with a corner ridge (3) dividing it into at least two retaining panels (2a) Partially folded down towards one another about the said corner ridge (3) so as to hold the said products (100) to be packaged, at least one end of the said corner ridge (3) being connected to the corresponding edges of the said retaining panels (2a) by at least one inclined centring profile. The stackable packaging unit (1) also comprises an intermediate element. The invention also pertains to a packaging comprising at least one such packaging unit (1).

Abstract: The present document describes a storage cabinet and a storage system for storing a liquid and/or a granulate matter. The storage system includes at least one storage container for storing the liquid and/or the granulate matter. The storage container includes a container body with a main access, a main lid removably mounted to the container body for covering the main access and a secondary lid removably mounted to the container body and/or the main lid for covering a secondary access on the container body and/or the main lid, where the container body includes a top portion and a bottom portion adapted for stacking. The storage system further includes a storage cabinet with a floor member which includes a stacking element for receiving the bottom portion of the container body.

Abstract: A tray system includes a first tray having a plurality of stacking units. In one embodiment, each stacking unit forms a lower receptacle for receiving a neck portion of a first bottle, and an upper receptacle for receiving a base portion of a second bottle to be stacked above the first bottle. The lower receptacle has a first end, a second end opposite the first end, and a sidewall connecting the first end with the second end. The first end forms an opening for receiving a neck of a second bottle into the lower receptacle. The tray system may also include a second tray and a pallet.

Abstract: A module for use in stacking plate panels, having: a supporting portion a load transmitting portion, connected to the outside of a supporting portion and a portion for positioning the plate panels horizontally, wherein the load transmitting portion includes receiving surfaces formed on the upper and lower portions of the module, and when the releasing surface of one module is mounted on the receiving surface of a second module, upon stacking the upper module on the lower module, the positioning portion has an upper engaging portion attached to an edge of the receiving surface, and limits a relative movement of the upper module to the lower module, and a lower engaging portion attached to the edge on the same side as the releasing surface on which the upper engaging portion is formed to offset the upper engaging portion, and limits a relative movement of the upper and lower modules.

Abstract: A tray for storing and transporting bottles includes a plurality of spaced apart base walls each for supporting a bottle thereon. A pair of opposed side walls and a plurality of interior columns are connected by a plurality of dividers. The dividers also connect the columns and the side walls to the base wall. Each divider includes a lower end having spaced apart pocket walls each connected to a different one of the base walls.

Abstract: A container for storing and/or dispensing liquid includes a body portion having a neck portion with an opening, at least one protrusion and at least one recessed portion, so that the container can utilize internal liquid pressure to provide strength for the container, so that less material is required for supporting the shape and structure of the container and so that the use of external packaging can be avoided.

Abstract: A blank of sheet material for forming a polygonal container is provided. The blank includes a bottom panel, two opposing end panels each extending from opposing end edges of the bottom panel, two opposing side panels each extending from opposing side edges of the bottom panel, and interior end panels foldably connected to each side edge of each side panel along a first fold line. The bottom panel includes a plurality of slots configured to receive stacking tabs of a formed container. Each side panel includes at least one stacking tab extending from a top edge of the side panel. Each interior end panel includes at least one stacking tab extending from a first edge of the respective interior end panel.

Abstract: Stackable container (1) having a body (2) and a bottom (3) comprising: an annular seat (10) defining a seating plane (11) complementary with a peripheral face (8) provided on a shoulder (4); a conical arch (14) that extends from the seat (10). In this container: an outer transverse extension Dext of the seat and an overall transverse extension D of the body are such that: Dext D ? 0.8 the arch (14) has a peripheral section (17) complementary with a frustoconical surface (7) of the shoulder (4), the seating plane (11) and the peripheral support section (17) define a contact surface, the projection of which on the seating plane (11) has a surface area SC such that: Sc S ? 0.4 where S is the surface area delimited by an outer perimeter (12) of the seat (10).

Abstract: Universal members placed between containers having different stacking patterns permit stacking of these containers regardless of the type of container positioned as the bottom container. The universal members include an appropriate thickness and a plurality of openings configured to receive the different stacking patterns. Depending on the containers being stacked, the universal members may take different forms. For example, one universal member may include T-shaped openings while another universal member may include rectangular-shaped openings with offset members.

Abstract: A component carrying tray includes a bottom plate on which a component is stacked, and a projection. The projection has a main body and a regulator. The main body is hollow and has a tapering shape. The regulator is formed in the main body and extends in a direction perpendicular to the carrying surface and contacts a side surface of the component to regulate the component carried on the carrying surface. The bottom plate has a through hole so that when the component carrying tray is stacked on an additional component carrying tray, a projection of the additional component carrying tray comes into the hollow part of the main body. An opening is formed in the projection and configured to avoid, when the component carrying tray is stacked on an additional component carrying tray, interference between the projection and a regulator of the additional component carrying tray.

Abstract: A module for stacking thin panels and a method of stacking thin panels when a plurality of thin panels are vertically stacked in a state of being supported by the modules capable of securing an adequate load transfer area for transferring a load of the thin panels. The module for stacking the thin panels includes: a support portion for supporting the thin panel from below; a load transfer portion connected to the support portion for transferring a weight of the thin panel downward; and a drop-off preventing portion for regulating horizontal movement of the thin panel. The load transfer portion includes a load transfer surface extending outward from the support portion, the load transfer surface includes a load receiving surface provided in an upper portion of the module and a load releasing surface provided in a lower portion of the module, and the drop-off preventing portion includes a protrusion portion protruding downward from a lower portion of the module.

Abstract: A gravity-feed bin includes a generally hollow main bin that has a storage reservoir and an open end. A first generally hollow extension section is selectably coupled to the open end of the main bin. The first extension section is in communication with the reservoir, and the storage capacity of the reservoir is increased by the first extension section. In some embodiments a seal element is intermediate the open end of the main bin and the first extension section, the seal element providing a substantially air-tight seal between the main bin and the first extension section. A plurality of extension sections and seal elements may be selectably coupled together in a stacked arrangement upon the main bin to increase the storage capacity of the reservoir.

Abstract: A stackable carrier system is disclosed that includes, inter alia, a first carrier body which defines an interior storage cavity, for items such as food. The first carrier body has opposed end walls and a first pair of opposed cover flaps which extend from respective end walls. Each of the opposed cover flaps define an interlock tab. The system further includes a second carrier body which also defines an interior storage cavity and has opposed end walls and a first pair of opposed cover flaps which extend from respective end walls. Each of the opposed end walls define a reception slot therein. Wherein the interlock tabs associated with the opposed cover flaps of the first carrier body are adapted and configured to interlock within the reception slots formed in the opposed end walls of the second carrier body when the second carrier body is placed on top of the first carrier body.

Abstract: A bakery tray includes a base member with a front end and a back end, and a pair of sidewalls extending upward from the base member and opposing each other between the front end and the back end of the base member. The sidewalls each have a pair of stacking blocks and a top rail with a pair of low stack recesses therein. The pair of stacking blocks includes a front block positioned a first distance from the front end and a rear block positioned a second distance from the back end. The pair of low stack recesses includes a front recess spaced from the front end by a distance corresponding to the second distance and a rear recess spaced from the back end by a distance corresponding to the first distance. By this structure, bakery trays are stackable in a low stack orientation and a high stack orientation.

Abstract: A reusable combined multi-part product shipping box and display tray. In one arrangement, the box includes two generally rectangular trays, each defining four sides, with four barrier portions projecting upward from each tray proximate its edges, one barrier portion at about the center of each of the sides, and four corner posts, one projecting up from each corner of the tray. The box includes a generally rectangular sleeve defining four sides and four corners, and open ends that are about the same size and shape as the trays, the sleeve adapted to engage with the trays to close its open ends and form a shipping container, the sleeve adapted to sit on the tray inside of and up against the barrier portions, with each corner of the sleeve located outside of and against a corner post, such that the sleeve is tightly engaged with the trays.

Abstract: A modular packaging system for shipping and displaying palletized products is provided. The packaging system comprises a plurality of vertically stacked trays for holding the products, corner posts extending between vertically adjacent trays for spacing and supporting the trays, and one or more separate elongated braces located under and supporting one or more of the trays. The ends of the braces extend into openings in the corner posts. The system is strong enough not only to support the weight of the products on the trays and withstand the vibration and impact forces that can occur during shipping, but to withstand the weight of one or more units stacked on top.

Abstract: Embodiments of this disclosure include a rigid tray container and methods and equipment for using the rigid tray container in batched process operations. In one embodiment, a mass container is sized and dimensioned to receive one or several rigid tray containers. In other embodiments, equipment is configured to lid/unlid, secure, stack, load/unload, and buffer rigid tray containers. In other embodiments, equipment is configured to stack and stage mass containers. In some embodiments, methods are provided for batch processing items.

Abstract: A combination paint can and non-splash lid which eliminates the sump area at the top of the paint can by providing a vertically oriented arcuate interior rim surrounding the opening which leads to the storage container where the paint is stored. The combination also includes a matching lid which can tightly fit onto the vertically oriented rim so that the paint can is able to be tightly sealed but when the lid is removed and paint is dispensed, there is not an interior sump where the paint can land and create problems. The device also contains a matching bottom which is designed to be inter-fit with a top to enable one paint can to be stacked on top of the other paint can and locked in place so that when they are vertically stacked, the upper paint can will not fall away from or off the lower paint can.

Abstract: A blank of sheet material for forming a polygonal container is provided. The blank includes a bottom panel, two opposing side panels, and two opposing end panels. Each side panel extends from a side edge of the bottom panel, and each end panel extends from an end edge of the bottom panel. Each end panel includes at least one major stacking extension extending from a top edge thereof. The blank further includes a reinforcing panel assembly extending from a first side edge of a first end panel of the two end panels. The reinforcing panel assembly includes an inner end panel having a minor stacking extension extending from a top edge thereof. The minor stacking extension is configured to align with a respective major stacking extension to form a stacking tab.

Abstract: An intermodal tank container and complementary chassis, and features and methods for use thereof, are disclosed. The intermodal tank container and chassis has an appearance and length substantially similar to a non-intermodal OTR tank trailer, while affording the same capacity as an intermodal tank container. The design of the tank container allows for an improved, lighter design for the chassis and for improved usability of the tank container in intermodal environments such as with rail cars. The reduced weight of the chassis allows for a greater payload while remaining within various applicable legal restrictions for gross vehicle weight, axle weight, etc.

Abstract: A toner cartridge packaging having a non-planar top surface is disclosed.

Abstract: A modular storage container is disclosed for use within a shower allowing water to pass through the container. The container comprises a recessed top surface, a protruding base and defined walls connected thereto. Both the top surface and base have slits cut therethrough to allow water to pass through the storage area. Each storage container is modular in design allowing each storage container unit to be placed upon one another. In order to stack multiple containers, the base of one unit fits securely into the raised lip perimeter of a second unit. An insert is placed onto the uppermost, recessed surface to prevent water from entering the top of the container. An optional front cover, such as a drawer or door, may be placed onto the front of the container to prevent water from entering from the open front of the container.

Abstract: A tray assembly includes a tray having a base, a pair of opposed side walls extending upward from side edges of the base. Front and rear walls extend upward from front and rear edges of the base. The front and rear walls are substantially shorter than the side walls. A liner has a base wall and a pair of opposed side walls. The liner is removably received within the tray. The product in the tray can be removed all at once along with the liner for more efficient stocking at a store.

Abstract: A securement device is provided for securing articles such as collapsed shipping racks together for maintaining their stability and alignment. The device includes a tether that is connectable between adjacent shipping racks to secure the racks together, and that provides a clear visual indication that the racks are secured. A securement device affixed to a collapsible shipping rack may further comprise a bracket member and upper and lower pin members coupled to the bracket member, with the tether having first and second opposite end portions and the first end portion of the tether being coupled to one of the upper and lower pin members, and the second end portion being releasably attachable to another securement device of another collapsible shipping rack adjacently stacked relative to the first collapsible shipping rack.

Abstract: A gas dissolving apparatus that combines a gas at first pressure into a working fluid, the working present at a second pressure equal to or greater than the first pressure. The device includes a molecular mixing chamber which is designed as a truncated conical chamber located between an inlet and an outlet. The device can include a plurality of inlets for the gas to enter into the mixing section, and a plurality of passages through the truncated conical chamber. The truncated conical chamber is surrounded by a cylindrical chamber leading to the outlet of the chamber.

Abstract: A storage system for storing a plurality of fluids or other goods has a plurality of containers adapted to fit within a receptacle. Each of the containers has an inner sidewall, an outer sidewall, and a top sidewall having a spout sealable with a cap such that the container contains the fluid or other goods when the cap is engaged with the spout. The plurality of containers are shaped such that the containers are stackable or nestable within the receptacle such that the containers tessellate, the inner sidewalls of the containers abutting each other, and the outer sidewalls abutting the inner surface of the receptacle.

Abstract: A container having a tubular body including a side wall, a bottom wall in the form of a spherical dome projecting to the interior of the container, and an upper wall in the form of an annular spherical dome, inferiorly attached to the side wall by an upper double seam. The bottom wall includes at least one seating region having a predetermined circumferential extension along a plane extending transversely with respect to an axis of the container and being axially spaced inwardly within the side wall of the container, the seating region being configured to be fitted around a respective circumferential extension a upper double seam of an identical and adjacent container inferiorly disposed in a vertical stack, and axially seated on said upper double seam, so as to define a single contact region between two vertically stacked containers.

Abstract: An apparatus including a box portion which may include a left side, a right side, a front side, a rear side, and a bottom. Each of the left, the right, the front, and the rear sides is connected to the bottom to be foldable with respect to the bottom, from an orientation parallel to the bottom to an orientation substantially perpendicular to the bottom. A device may be connected to the bottom, including an inner peripheral wall which extends, substantially perpendicularly from the bottom. The inner peripheral wall may be substantially in the shape of a loop and may have a width and a length, substantially perpendicular to the height of the device, slightly less than a width and a length, respectively, of an inner chamber defined by top edges of the left, the right, the front, and the rear sides, of the box portion in an upright state.

Abstract: A stackable container assembly includes a lid portion having first raised members projecting outwardly from an upper surface, at least some of the first raised members cooperatively forming first receiving areas, and a base portion coupleable to the lid portion and forming a containment space. The base portion includes second raised members projecting outwardly from a lower surface, at least some of the second raised members cooperatively forming second receiving areas being adapted to fittingly receive first raised members of a like container assembly positioned below the lower surface. And, the first receiving areas are adapted to fittingly receive second raised members of another like container assembly positioned above the upper surface.