Bankers Box File 100% Recycled Medium-Duty Storage Boxes, Letter/Legal, 4-Pack (1277007) Double end, single 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 Medium-duty storage box with locking lid for stacking or shelving letter- or legal-size files. Easy one step FastFold(TM) set up This items packaging will indicate what is inside and cannot be hidden.