Features: Smooth zipper open and close, durable hardware, prevent getting stuck. Oxford cloth material, wear-resistant, waterproof. Pack inner designed have phone pocket, concealed zipper pocket, anti-theft. Sewing thread making craft, smooth stitching, the lines are not easy to break off. Multilayer storage, small size, large capacity, scientific and reasonable storage, improve the use of space. Adjustable shoulder straps length, flexible buckle can switch from side to side, improve usage comfortable level. High elasticity back pad, breathable, keep back dry, 3 generation USB port, delicate and practical.