This carry-on bag is equipped with DELSEY dual-advanced wheel system. The telescopic handle locks into two positions and the back wheels are 20% larger to resist wear and tear, and accommodate both two or four wheel use . Three carry handles - on the top, on the side and at the bottom - providing maximum convenience when lifting a fully packed case. Plus, thanks to its USB port and a power bank sleeve (power bank not provided), you will never run out of power on the go ! The size and weight restrictions for carry-on luggage vary by airline.