(TrendHunter.com) The Airback FLEX backpack is a different kind of luggage design engineered with the needs of frequent flyers to help them eliminate the need for checked baggage or dealign with overhead bins. The…(TrendHunter.com) The Airback FLEX backpack is a different kind of luggage design engineered with the needs of frequent flyers to help them eliminate the need for checked baggage or dealign with overhead bins. The…