Bankers Box R-KIVE Heavy-Duty Storage Boxes, FastFold, Lift-Off Lid, Letter/Legal, 4 Pack (0072506) Heavy-duty, triple end, double side, double bottom 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