Abstract: A returnable reusable container which may be quickly assembled to contain a product and quickly disassembled to a substantially flat condition for storage and return shipping when empty. The container has a rigid member extending around its upper perimeter to prevent twisting of the container. This member has locking means to hold the container in an assembled position, and which unlock to allow the disassembly of the container. The locking means when engaged restrains relative movement at the corners in all directions except the direction required to disengage the lock. When the flaps are fixed to the sides of the container, relative movement at the corners is restrained in all directions.

Abstract: A container that can be collapsed and returned to the sender for re-use. The container is made of a flat thermoplastic board comprised of a first sheet and a second sheet held in spaced relation to one another by webbing. A single sheet may be 0.020 inches thick more or less. The container has square corners, is strong and durable. The container has sides and ends formed by cutting one sheet, leaving the other for a hinge and attaching the sides and ends by means of Velcro.