The strap on the back is extremely TIGHT and the strap placement is way too high to fit over another handle.  I called Travelpro and the customer service rep was very empathetic since they are aware of this problem.  At this expensive price, Travelpro needs to send the design back to the drawing board and use common sense with a new design.  I returned it to Amazon and got the American Tourister instead which is cheaper and designed to perfection.