Power Generating Backpack

If you spend most of your time outdoors away from an electric power plug, recharging your gadgets becomes... complicated.
And while this might be annoying if your GPS or cellphone dies in the middle of your trekking, it might have far more serious consequences if it happens to a soldier in hostile territory.
That's why this power generating backpack was originally conceived for the military.

This backpack system can generate up to 8W while walking, and an amazing 44W while running.