Ordered this in preparation for a trip to South America. It has a detachable day pack, wheels, AND backpack straps = very handy when you have to navigate stairs! The case without the backpack attached fit in the overhead compartments of all my flights - even the smallest. And the backpack fits under the seat even when stuffed with blanket, pillow and laptop. Will be taking it on its 12th flight soon and it looks new. Highly recommend.