Heavy-duty, environmentally friendly box feature a secure locking, liftoff lid. Ideal for stacking without shelving and archiving inactive files with its triple-end, double-side, double-bottom construction. Multilayered construction offers 70 percent more stacking strength than basic letter-size/legal-size boxes. FastFold One Step Setup makes box assembly fast and easy. Locking liftoff lid stays in place for secure file storage. Reinforced hand holes resist tearing and make the box comfortable to carry. Storage box is built for heavy daily usage and maximum stackability. Average amount of evenly distributed weight that can be safely stacked on top of box is 800 lb. Boxes are made with a high percentage of recycled material.