A cargo support for vehicles comprises a pair of spaced end panels with transversely extending rib panels which are positioned at predetermined intervals to form cargo bays. The transverse ribs include a creased center fold and are hinged at their ends to the panels. The ribs include a central cut-out for ease of folding, tabs which connect at each end to the end panels and lower outrigger portions for support purposes which extend through apertures in the end panels. Once the ribs are assembled to the panels, the cargo support may be collapsed in an accordion fashion for storage purposes. The cargo support is inexpensive, easy to assemble and may be readily used in an automobile trunk, cargo area or on the rear seat.