This kind of cool, stylish and durable solar power backpack will be great fun for you. Features: It is crafted from water resistant nylon, high intensity and durable. Come with solar panel, it is convenient for you to charge your or ipad. The buckles around the chest to stop slipping. Adjustable straps and breathable mesh backing for comfortable carry. With bottle bag on both sides, portable to carry water with you. Various pockets for items storage, such as , computers, books and other daily products. This backpack is perfect for school, traveling, cycling, hiking, camping and other activities on the go. Solar Backpack Specification: Bag capacity:30-40L Bag material:Canvas Available bag color;army green or OEM color Bag size:47*36*20cm Solar Panel Specification: USB output:5V 2A Solar Sunpower solar >22.5% Maximum power(Pm):10W Voltage at max power(Vmp)?6.5V Current at max power(Imp)?1.54A Open circuit voltage(Voc)?7.8V Short circuit current(Isc)?1.69A Net weight ?650g Operating Temperature?- 40??+85?