Abstract: A knock-down cart has a generally rectangular box-like structure having two side panels and at least two columns of vertically spaced horizontal ledges struck out inwardly from each of the side panels. The side panels are reinforced and stiffened by a C-shaped bracket attached between each side panel and a corresponding outer panel. A bottom wheel mount is provided for mounting caster wheel units to a bottom panel. The cart has a simple construction, and is sturdy, easy to use, and adapted to receive modular containers and shelves in a variety of arrangements.