Using the same principles as wave generators, U of Pennsylvania biologist Lawrence Rome has created a backpack that generates about 7 watts of electricity. It works by harnessing the kinetic energy of your body’s movements with shock absorbing parts (and some other complicated stuff).

Amazingly, it’s not much heavier than a normal pack — maybe a few ounces — and early testers say it’s actually more comfortable than normal backpacks.  This is great news for the gadget gear hiker. Hit up TreeHugger for more details.