Recharge your gear while you walk

I really could have used this while doing the Grand Canyon hike.

Neat tech from Bionic Power: The PowerWalk is a wearable device, that harnesses energy as the user walks, charging batteries and other devices. It weighs about 850 grams per leg and generates an average of 12 watts of electricity. Reviews showed it actually made walking less of a chore while not restricting movement. More than one hour of walking can charge four mobile phones.

We ran out of battery power on the main camera, and so had to really use (over use?) the GoPro which was a little lighter on the power budget.

But, with a suit like this to generate electricity, we would have been in great shape.
I hope that one day the cost comes down and guys like me might be able to have one.