Features: Superior oxford cloth, high density weaving craft, waterproof dampproof. Multiple layer storage space, large capacity main pocket. Back anti-theft pocket, password lock design, dual safe design. Three-dimensional breathable pressure relief pad, keep back dry and sweatproof. External USB port, elastic buckle, adjust straps length, delicate and practical. The shoulder strap have bus card position, easy to use and storage, anti-lost. D-shape buckle design, left and right transform wearing design, flexible, release pressure.