This unique bag features an expandable top section that increases your packing by capacity by another 9.5" in height. 2 in-line skate wheels and telescopic handle make this bag very versatile. Made of heavy-duty 1,680 Denier ballistic polyester, the full height of the bag with the wheels is 17.5" and meets most airline underseater restrictions. Weighs only 5.0 lbs.