There are a lot of chargers out there and there is a few things you need to know about backpacking with one. 1 amp chargers are obsolete for most smart phones. (That is most of them on Amazon) 2 amp reduces charge times to less than three hours. Most chargers continue to charge even when you reach 100% thus depleting the charger battery. IC3 is a sensing circuit that prevents overcharging and shuts the charger battery down at 100% Powercore is charging as fast as your phone can handle it. SO IC3 is a step up and works exstreamly well for solar, Powercore is the latest circuit and maximizes the number of charges and further decreases the time to charge. I am told these are smaller and lighter than previous versions.
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Anker PowerCore II 20000
Anker PowerCore 20100
Anker PowerCore 13000
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Anker PowerCore II 20000
Anker PowerCore 20100
Anker PowerCore 13000
Be wise enough to walk away from the nonsense around you!