If your into hiking you should be able to appreciate this invention set to hit stores soon. Its a solar powered backpack designed with dye-sensitized solar cells (DSSC) are thin-film photovoltaics that can be manufactured in flexible rolls relatively cheaply.  It is the same material the military has been looking into for its unmanned aerial vehicles to increase the flight time.

Dont get to excited, while this amazing technology is currently being integrated into a line of backpacks, e-book covers, camera bags, and a few other hand-held carry items.  It will only be able to charge items like cell phones, cameras, PDA’s, a GPS, and other small electronic devices. But then again how many people go backpacking with a laptop, or refrigerator?