Solarmonkey charger with a tough water- and shock-resistant clam-shell case, attaches to your backpack hitting the trail. Unlike other solar chargers, it includes an internal battery that, when fully charged, can charge a smartphone two to three times. It takes about 8 hours to get a full charge and comes with a variety of adapters for all your gadgets. It retails for $132.
SolarGoPack 10k, solar powered backpack, charge mobile devices, Take Your Power with You, 12,000 mAh Lithium Ion Battery - Stay Charged My Friends !! ** New and awesome product awaits you, Read it now : Day backpacks