Lightning Packs Backpack Generates 40 Watts Just By Walking

This power-generating backpack was filmed at the Modern Day Marine trade show in Quantico. Proposed several years ago by Lightning Packs the prototype is now reality. It can generate over 40 watts just by walking at a cost of a candy bar worth of human energy if used all day! The backpack is mounted on rails that it slides up and down on when its wearer walks or runs. The movement generates electricity that charges a lithium ion battery to power your gadgets or the juice can go directly to a device. An added benefit is that the design relieves stress for the wearer. I want one! No word on when the military is getting these or a commercial version.
Via Gizmodo
http://www.lightningpacks.com/