This is my favorite solar panel: http://www.amazon.com/Suntactics-sCharge...ords=suntactics

Another good option: http://www.amazon.com/Anker-Charger-Powe...scsubtag=WC5297

Pair either with something like this: http://www.amazon.com/gp/product/B00VLNT9KW/?tag=thewire06-20&ascsubtag=WC67037

If you just want something for weekends away but near civilization, I LOVE this, but you need 110-240v to recharge it: http://www.ravpower.com/savior-9000mah-portable-charger-with-apple-lighting-cable.html