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Think about it. You have no weight on your feet at all, so the impact on knees, ankles, hips and other joints is minimized--saving energy to the point that you could *walk* several miles in the same time it takes you to jog one mile with a lot less effort than jogging. I could see maybe a hinge at the shoulders so you could stand upright without having to lift the front wheel off the ground.

You also seem to ignore the possibilities for carrying a lot more on this than a mere backpack--without carrying that weight on your shoulders.

This thing is ingenious!