Presto Storage Box offers quick setup. Simply push the corners together, and the box is ready for use to store letter-size or legal-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 850 lb. Ergonomic handles are engineered for maximum comfort and reduced wrist strain. Design also includes a deep locking, liftoff lid. Storage box is made of a high percentage of recycled material.