This is an excellent carry on.  It fits perfectly on it's back under the airplane seat and the wheels help roll it under there.  Roomy and light weight, easy to carry by its handle and so easy to wheel.  My husband and I each have one, and one slides perfectly on top of the other one's extended handle and there is still plenty of room on top of those two for my purse to sit on so all three pieces, stacked one on top of the other, wheeled like a dream through the airport.  There is a removable inner piece with zippered pouches that we didn't take on our trip because we didn't need that many zippered pockets. We recommend these highly!