floating' backpack bounces up-and-down to reduce stress on your back
HoverGlide "floating" backpacks use rails and pulleys to lighten the load
Hoverglide Weightless Backpack: A Backpack That Bounces Up And Down | Moving Backpack | Backpack With Suspension System | First Responder Backpack | Lightning Backpack - Plugined
HoverGlide: World's First Floating Backpack | Indiegogo