This backpack could pique the interest of those with back problems and have a hard time carrying heavy luggage. The utility-patented concept has an air system incorporated into the bottom of the backpack that enables the weight to sit only in the bottom area of the backpack, taking all the pressure of carrying the backpack on your shoulders and upper portion of your back. Air is pumped into the backpack similar to a tire pump, with a tire valve-like contraception at the front of the backpack. The product is currently sold in more than 3,000 stores across 20 countries. AirBac.com. Bags are sold on retail from $59.99 to $99.99.