Abstract: A collapsible container, which maximizes the collapsed height to non-collapsed storage volume ratio, includes four vertical side assemblies, a base member and a top support frame. The base member defines a footprint of “x” length and “y” width. In the collapsed state, the vertical height of the container assembly is equivalent to five thicknesses of the base and in the non-collapsed state, the vertical height is equal to the shorter of “x” and “y.” A collapsible container is further provided in which, in the collapsed condition, all side walls and the top overlie the base and two opposed side walls are folded.