Abstract: A stackable container has corners which have ridges that extend above the sidewall. These ridges mate with slots in the bottom walls of similar containers when the containers are stacked. Corner flaps which connect adjacent sidewalls form triangular posts that serve to support the weight of containers stacked on it. The section of the corner flap that extends along the adjacent sidewalls also have ridges that extend above the sidewall but the section that extends diagonally across the corner has a height that is equal to the height of the sidewalls. This allows this section to rest against the bottom wall of a container stacked on it instead of mating with a slot.

Abstract: A stackable container formed from a sheet of material that is die-cut, for example, and folded to form an open box having a bottom, side walls, and end walls having extensions. Crests formed on the upper edges of the end walls and the extensions provide double-thickness crests when the extensions are folded back onto the inside of the end walls. The double-thickness crests fit into corresponding holes made in the lower edges of the end walls of the open box, such that another similar box can be set securely on the upper edges of the box. Thus, a plurality of boxes can be superimposed, fitting one on top of another, to form stable stacks. The extensions are divided vertically into a first section, a central section and a final section. The extensions are folded inside the box to form prism-shaped reinforcements, the central sections being folded at an oblique angle across the corners of the box.

Abstract: A shallow open top container intended for the packing of perishable products, such as fresh fruit, is constructed from a board of stampable material and includes a rectangular bottom, long side panels or cheeks, and short end panels. The latter are considerably greater in height than are the long side panels. In the upper part of each corner of the container there are small transverse partitions arranged to form corresponding supports on which another container rests in an adjoining plane above the plane of the first mentioned container. The transverse partitions also provide angular positioning ridges that extend slightly above the end panels. Angular positioning ridges at the corners of a lower container extend upward into lower edge corner cutouts of an upper container that is stacked immediately above the lower container.

Abstract: An economic stackable container of foldable corrugated material with improved strength for forming a stable stack of containers. Ventilation spaces are provided between stacked containers. The arrangement of panel is disclosed. An extension formed at the top at each corner projects into a notch formed at the bottom of a respective corner of the container above. The panels are particularly reinforced by folded panels at the corners. A separate reinforcing sheet is applied around the periphery of the panels of the main sheet. The sheets have their corrugations in the various panels oriented for strength.