Bankers Box Stor/File Medium-Duty Storage Boxes feature double-end, 1 1/2-side, double-bottom construction. Medium-duty for use with or without shelving. FastFold® quick and easy assembly. Deep, locking lift-off lid stays in place for secure file storage. Rolled edges add strength and prevent paper cuts. Great for storing files, home office items, books, toys, or anything else you want to keep and store. Made from corrugated cardboard.