V-Dimension Helius solar-powered backpack
You know how annoying it is for your phone to die halfway through the school day because you forgot to charge it the night before, especially if you're heading for a new part of the campus and need to access Google Maps. The clever solar panel in the Helius backpack ($129.95, heavily discounted at online vendors) can give your small devices a boost wherever you are.
The pack comes with iPod/iPhone, Mini-USB, Micro-USB, Samsung, LG and Nokia adapters; the company says it will charge a phone in two to three hours. While it can't charge larger devices, the pack has room to carry up to a 15-in. laptop.