Backpack with USB interface is great to enjoy the convenient charging on the go so that you can enjoy the outdoor activities but do not worry about no power of your phone. Please note this backpack not include power bank just for easy charging also the best gifts for your friends and family. Anti-Theft design with two combination locks: one bonus metal combination lock and backpack lock itself for alternative, together with Metal Zippers, it is safe guaranteed for protecting your valuable items inside. The shoulder straps and back are comfortable, breathable and Sweat absorption. The shoulder strap uses a wide design and reduce the pressure to your shoulder and ergonomic back pad make you comfortable even in a long time and high load using.