A Solar Power Bank, just hang it on your backpack (I hang it at my belt). Comes with several ports (USB included, obviously).
Very cheap considering that it may literally save your life by keeping your phone/GPS alive totally disconnected from the electric grid. Some come with an LED high power flashlight at the reverse side.
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that is an amazing gadget i was totally unaware of. thats gonna be my lifesaver (well, more likely my social network saver if we are honest haha). Thank you!