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, back anti-theft pocket. Adjustable shoulder straps length, suction buckle, improve usage comfortable level. Thicken back material, breathable, burden alleviation, shakeproof.