Heavy-duty, triple-end, double-side, double-bottom construction stacks up stronger and withstands frequent handling. FastFold™ quick and easy assembly. Reinforced tear-resistant handles make box comfortable to carry. Deep, locking, lift-off lid stays in place for secure file storage. Smooth rolled edges add strength and prevent paper cuts. Box Type: Stackable File Storage; Box Style: FastFold™ Quick & Easy Assembly; Strength: Heavy-Duty; File Size Format: Letter/Legal.