Enjoy free unlimited on-the-go power? The solar charger backpack – perfect choice for any outdoor enthusiast. It comes with plenty of pockets & compartments for maps, documents and essential gear. Perfect for backpacking, trekking, mountaineering, fishing or biking, it is made of high quality.With 22% transfer efficiency solar cell, are built into a protective anti-scratch hardened coating & sewn into high-wear PVC fabric for weather-resistant outdoor durability.Charge your device directly through a 5V USB port,The removable solar charger with Voltage Stability Controller,for GPS systems, MP3 Players, Bluetooth Speakers and more!The backpack is perfect for day-to-day use or occasional travel, and great gift for any age.