Double-end, 1 1/2-side, double-bottom construction. Medium-duty for use with or without shelving. FastFold quick and easy assembly. Five, 5-inch dividers keep files upright even when box is partially full. Deep locking lift-off lid stays in place for secure file storage. Rolled edges add strength and prevent paper cuts. Stock up and save! Box Style: General Storage; Box Type: FastFold; Material(s): Double End; 1 1/2 Side (Rolled Over Edge); Double Bottom; Strength: Medium-Duty.