The solar backpack is made of Oxford cloth, it includes a 14 inches backpack, a 6.5 Watts solar panel, the panel can be removed from the backpack to use alone. The solar panel absorbs solar energy, high efficiency up to 24% transfer rate, converts into electrical energy to charge your cellphone or other small gadgets, make sure the solar panel is under strong sunlight when charging your devices. If the panel can not work, please check the USB interface is plugged into the solar panel exactly.
^We provide full range of printing methods for your choice and requests.