Patent ID: 8770421

Claim:
A collapsible container comprising: a base comprising spaced apart top and bottom surfaces joined by a pair of base end walls and a pair of base side walls, a pair of integral end walls, and a pair of removable side walls; wherein, said end walls are pivotally attached to said base; a lower offset edge of said side walls reversibly and directly engages a groove in a top peripheral surface of said base by a tongue and groove interaction, said groove in said top peripheral surface of said base extending along the entire length of said base side wall; said end walls and said side walls reversibly and directly engage one another along adjacent edges by a tongue and groove interaction; said end walls and said side walls are a twinned wall structure defined by inner and outer wall members made of plastic; and each of said side walls comprises two side wall panels pivotally attached to one another along a vertical axis, the vertical axis being substantially perpendicular to said base, when the container is in an erect condition; and wherein at least one of said side walls and said end walls has a plurality of elongated concave indentations, each concave indentation independently forming a substantially vertical internal arch between said inner and outer wall members, said arch being arcuately shaped and spanning the length of said concave indentation.