Waterproof Fabric The sling bag is made of Oxford fabric with high density nylon lining, which has good waterproof performance, protects your belongings from splashing water and rain. High Quality Double Zippers Smooth two-way zippers are a very important component of the men and women casual daypack backpack, which are made of heavy duty metal material, wear-resistant, anti-oxidated and easy to slide and work smoothly. Breathable & Decompression Backpack with back U shaped three-dimensional ventilation design helps with air convection, ventilation and heat elimination. Wide breathable mesh shoulder strap and back with plentiful sponge pads help relieve the stress from your shoulder. USB Charging Port Design The shoulder bag comes with a charging port you can link your phone to and easily charge during outdoors and travel. Card Pocket Friendly card pocket design on the shoulder strap, it's very convenient after your daily work. Anti-theft Pocket The hidden zipper pocket provides additional anti theft protection on the back of the backpack. Adjustment Buckle The adjustment buckle is made of durable metal material, which is easily and quickly adjusts to whatever length you need. Adjustable Chest Buckle By hooking the connection, easy to disassemble, free to switch. Unique locking design for the left / right buckle, it's more tighten for the strap and not easy to loose. Bag for Unisex It is not only a sling backpack, but also a perfect shoulder bag, sling bag, holds 9.7 Inch iPad, with USB charging port. Widely Applications Sling backpack for men is ideal for multi-occasion, which is used for hiking, walking, cycling, hunting, traveling, camping, everyday use etc. Password setting method: The default password combination is: 0-0-0.Whe