A hinged collapsible container having a rigid construction including a base and upstanding hinged sides connected to a base having a generally flat supporting surface with a plurality of legs with mortises arranged to extend downward from the planar base support surface to receive and secure tenons attached to upstanding hinged sides. The plurality of legs are spaced about the periphery of the base and are adapted to be easily supported by a forklift. Upstanding hinged sides with tenons inserted into mortise elements of the unit are held in substantially erect position with the edges of the upstanding sides having a lap joint corner construction. Two of the sides are provided with latches at the edges to lock the upstanding sides together. The upstanding sides are hinged above the tenons to permit the hinged sides to be folded on the base. An access gate in at least one side is hinged and latched to the side and is locked in place by a boss and cavity lock.