Heavy duty, triple-end, double-side construction stacks up stronger and withstands frequent handling. FastFold? quick and easy assembly. Reinforced tear-resistant hand holes 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. 5" dividers keep files upright even when box is partially full. Box Type: Fast Fold?; Material(s): Corrugated; Strength: Heavy-Duty; File Size Format: Letter/Legal.