Power Practical makes the PowerPot and they are now doing an indiegogo project to get funded to do a pocket solar panel. Both output 5W to USB. Basically this will charge your tablet or phone at a fairly quick rate. These are extremely durable and phones (especially if pre-loaded with useful info and potentially apps) could be much more of an asset than just a luxury in a catastrophic scenario.
I certainly don't get paid for this, but I do have a buddy who works for them and I did some work on their website. Still, I think it's applicable, and a really cool idea worth sharing, so I hope you won't see it as spam.
I'm not going to link to it, as I don't want to cross the line of "advertising". It's easy to Google "Powerpot" or "Solar Stash" if you're interested :)
Freedom in our lifetime! - fiol.us
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