The foldable wire mesh cage is one of the most common containers in warehousing. The product itself is sturdy, ships conveniently, and folds flat for repeated use, which saves warehousing companies real labor and packaging cost. It works on the production floor, and also doubles as display and temporary storage in a supermarket. The improved foldable cage sits directly on racking, rides along a production line, and stacks on top of other cages. Wheeled versions roll easily around the workshop. Adding a PVC sheet or steel sheet stops small parts from falling through the mesh. Adding square tube lets the cage sit directly on a rack.