US Patent 7350661 Container

An open top box-shaped container is provided having a pair of confronting end walls tiltably pivoted and coupled to a bottom wall, wherein the end walls are pivoted at the bottom wall so as to be folded in contact with a top of the bottom wall, a pair of side walls are tiltably pivoted and coupled to the bottom wall so as to be folded in contact with a top of the end walls, wherein a side stopping protrusion is formed on a pivoting side edge of the side walls, that side stopping protrusion being a sectional U shape, such that when the side wall is in an erect position a side stopping groove on the bottom wall mates with each side stopping protrusion to form an erect side stopping structure.