Presto Storage Box offers quick setup. Simply push the corners together, and the box is ready for use to store letter-size files. Heavy-duty, Bankers Box is strong, dependable, portable and stackable with a double-bottom, double-end, double-side construction. Ideal for frequent access. Stacking weight is 750 lb. Design also includes reinforced, tear-resistant hand holes and a deep locking, liftoff lid. Storage box is made of a high percentage of recycled material.