Abstract: A container formed from an integral piece of corrugated material includes projections extending from its upper side edges, and notches disposed on its lower side edges. The projections of one container are placed and sized to engage the notches of a similar container so that the containers engage when stacked. The engagement of the sides is such that the containers are unlikely to be inadvertently horizontally displaced, and have increased vertical weight bearing strength. The containers are apt for shipping and display cartons stacked on pallets accessed directly by end-user customers. The containers have four-layer sides to further bear vertical forces, to resist inadvertent collapse of the container or a stack of containers, and to increase horizontal rigidity.

Abstract: A reinforced display carton is cut from a single sheet of material and folded to form exterior wall panels, bottom flaps and an internal subdividing web, that can be collapsed flat for shipping. The bottom flaps lock together when the carton is erected into a rectilinear state, and engage with the subdividing web, which is reinforced by folded over panels. A barb shaped slotted tongue on one of the bottom flaps fits into a slot between the other bottom flaps to lock them, and straddles a lower edge of the internal web. The subdividing web is formed from an extension of a half-width rear panel folded at a rear glue joint with a second half-width rear panel, and is attached at a glue tab to the back side of the front panel. The web has upper and lower reinforcing panels folded up and down over one another and locked in the slot of the tongue. Access openings extend up to the top edge of the front wall on either side of the central web, and the central web reinforces the carton against vertical forces, e.g.

Abstract: A carton is cut out and foldably formed from an integral piece of corrugated paperboard or similar sheet material, and has foldable bottom flaps and foldable closure flaps attached to panels forming side walls. Some of the panels define sidewalls forming a rectilinear carton, and at least one panel defines a partition dividing the carton into at least two compartments. Another panel defines a front wall of the carton, and has openings permitting access through the front wall to the compartments. The closure flaps have flanges which cover the access openings during shipping and inventory storage of the closed carton. The closure flaps are defined by fold lines that are weakened by scoring, perforating or the like, and are easily severed at the weakened fold lines. The carton can be assembled and folded flat, and erected for closure of the bottom, loading with product, and closure of the top.

Abstract: A self-erecting container 20 has a removable section 32 adjacent the engaging panels of a self-erecting end structure, and a permanent web which supports the self-erecting structure notwithstanding separation of the removable panel. A front side wall panel 24 has a removable section 32 at an end of the container adjacent the self-erecting structure 42, 44, 54, 56. A flap panel 44 is attached at least initially to the removable section 32. An end panel 56 adjacent the flat panel 44 has a back-folded tab 62 fixed to the flap panel 44 by a permanently attached web 60, maintaining the structural integrity of the self-erecting container bottom when removable section 32 is separated from front side wall panel 24.