Features: A hidden compartment designed for mobile phones, wallets, keys and other urgent items. Thickened waterproof fabric, rainproof and wear-resistant. One pack multi-purpose, can be used as a single shoulder or backpack. There are reflective strips on both sides to enhance the safety of night and haze travel. Waterproof two-way zipper design makes it easy to pick up items from all angles. Elastic storage rope design, can hang storage gloves, lightweight clothing and other soft items. Comfortable handle design, easy to use, long service life. Removable hollow mesh strap and thickened foam honeycomb back pad reduce back pressure and improve back comfort. Fine quality plastics material buckle, fast and smooth installation and disassembly.