This is a smart suitcase, even with a charger, my only concern is going up a short flight of steps, say may be 2, 3 or 4 steps, it may not save any effort there. And secondly is going down a long flight of stair, going up is no problem, but what about going down? To pull behind a heavy suitcase may not be as easy.
RE: Traxpack - You don't need to lift heavy bags anymore