Heavy duty storage box featuring ergonomic handles to reduce wrist strain. Box handles are engineered with a 30-degree angle, which allows your wrists to maintain a neutral position while lifting or carrying. A neutral wrist position optimizes comfort & reduces wrist strain. Heavy duty box features three layers of board end panels & two layers to sides & base for maximum strength. Reinforced handles & lock-in lid make box comfortable for you to lift & carry. Quick & easy Fast Fold automatic assembly. Compatible with A4 or folio transfer files, ring binders or lever arch files. Security hole for optional use with cable ties (cable ties not supplied).