Away Travel - Flex luggage is designed with a wraparound expandable zipper for extra packing space when you need it. The Bigger Carry-On Flex is our best-selling, standard-size Carry-On designed to maximize packing space and fit most overhead bins of major US airlines. Unzip the Flex feature for an extra 2.25" (6 cm) of space and use it as checked luggage. Plus, enjoy the same features you know and love about our Classic Carry-Ons, including a durable hardshell and a signature interior compression system that helps you pack (and protect) more. Details like an ultra-sturdy handle, underside grab handle, and premium 360° wheels make it easier than ever to maneuver and lift your suitcase. It's a best-of-both-worlds type of thing.