Ergonomic design! Presto handles are engineered for maximum comfort and reduced wrist strain. Instant assembly - just push corners together, and the box is ready for use. Heavy-duty, double-end, double-side and double-bottom construction for stacking, storage and transport you can trust. Deep, locking, lift-off lid stays in place for secure file storage. Secure, zip-tie closure for added security (ties not included). Reinforced, tear-resistant hand holes.