This Solar Charging Backpack is built tough for use as a weekend hike bag or as a large daypack. With the large main compartment and front pocket there is plenty of room to take your things with you. The built in solar panel make it easy to charge your iPod, cell phone or most any electronic device. The cool thing about this solar panel is that it doesn’t matter if its cloudy or you’re stuck inside, indoor lighting will charge your devices too.