In travel, we often encounter that the phone suddenly has no electricity, which cause us great inconvenience. Solar backpacks which can be installed item chargers are specifically designed for electronic equipment chargers and do not need any power sockets.Different from the past solar chargers,this kind of solar backpacks can use the one-time cells or charging batteries directly to the mobile phone charging in the overcast sky. If it is sunny, the batteries can be changed to solar without weather constraints. This kind of backpack can charge for most small electronic products, including brand mobile phone, PDA, iPod, digital cameras, CD machines batteries,etc. We equip backpacks which suitable for a variety of mobile phone brands charging conversion connectors, and we also provide many other electronic equipments for the connectors for charging users choice. In the top of this backpack embed solar panels with lightweight waterproof to the boards, powered 0.75 Watte. In the electrical boxes which install backpack batteries for storage of electrical energy can provide power whenever you need. In addition, these storage box packages with travel chargers and charging vehicles not only can use with backpacks but also can use separately .