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A single substantially rectangular blank of fiberboard-type sheet material folded along longitudinal and central transverse triangular creases or score lines to form an open top and closed bottom substantially polygonal, such as octagonal, prism-shaped container. The straight fold lines between the

A single substantially rectangular blank of fiberboard-type sheet material folded along longitudinal and central transverse triangular creases or score lines to form an open top and closed bottom substantially polygonal, such as octagonal, prism-shaped container. The straight fold lines between the bottom triangular and side rectangular panels alternately angle of about 10.degree. with respect to each other successively around the bottom or base of the container, and the two opposite triangular double-thickness flaps extending from adjacent pairs of opposite side panels fold under the bottom so that their apeces substantially touch each other and said triangular flaps are attached to the bottom either by a staple means or an adhesive or both. The angular fold edges around the periphery of the base insure ample space under the container for these triangular flaps so the container when sitting on its base will rest primarily on alternate peripheral corners of the base, insuring its stable vertical condition. Diametrically opposite sides of the container along edges of one of the panels are flaps which are adhered by adhesive to adjacent panels to seal the opposite adjoining sidewalls of the blank and permit the collapse of the blank until ready for use by being set-up with bottom triangular flaps folded under and fastened to the bottom of the set-up container.

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