Perfectly compact and completely convenient. the Roundtrip® Rolling UnderSeat Carry-on features built-in organization. durable construction. and high-performance wheels that roll with ease. This bag also includes a removable. water-resistant organizer with built-in hook for hanging use at your destination. Great on its own for quick trips or as a stackable companion to your other luggage. this compact carry-on is also conveniently sized to fit under the seats on most domestic airlines.