When you're camping, there's a pretty obvious shortage of power outlets around for you to charge up your gadgets with. But if you bring along the Hatsuden-Nabe, you can juice up your phone using only a campfire.
The Hatsuden-Nabe is essentially a pot with a cable coming out of it. When it's heated up and cooking beans or whatever else you eat while camping, you can plug your phone in to get charged. It takes 3-5 hours to fully charge your phone, which is a long time, but it should provide you with enough juice to get a call out in a pinch, and it's a good backup plan for emergency situations.
It ain't cheap, however, with the pricetag set at a serious $280. Maybe just pack some battery packs instead.