In 2013 I purchased a Wakawaka solar charger from a European supplier (I am in Canada). Charged my phone, acted as a flashlight and contributed to a non-profit through the purchase! I used it a few times when the my walking partner and I were separated for a few days (we brought a single charger & cord between us) and when the chargers/outlets at albergues were full or scarce (not all have great numbers of outlets). It could charge while walking and resting, when I placed it out in the sun . . . Saved me a few times, and the weight was not a burden!