Abstract: A reusable container has four vertical side walls affixed to a rectangular base that can be moved between an extended position and a folded position. When the vertical side walls are in the extended position, the vertical side walls form a rectangular enclosure about a rectangular base. The rectangular enclosure can be divided into two sections by one or more movable members positioned within the rectangular enclosure for transporting different-sized documents, papers, or files. The vertical side walls may be moved into a folded position when the reusable container is empty to reduce the space required for transporting the empty containers. The reusable container interlocks with other reusable containers stacked on a dolly in either the extended position or the folded position such that stacks of reusable containers can be pushed on a dolly up inclines and over bumps without any restraints.