Abstract: A collapsible box-type, water-proof shipping container comprising pivoting end walls and bifolding side walls. The end walls pivot inwardly of the container to lie on its base and the side walls fold longitudinally to lie on top of the end walls. The end walls and the side walls are completely enclosed within the base structure when collapsed, and the top wall completely seals the side and end walls from the exterior. The collapsed container takes up a volume approximately one quarter of that of the fully erected container and may be locked in its collapsed state. Provision is also made for locking to other containers above and below.