HELIUM AERO is made from lightweight and durable polycarbonate material while featuring a sleek, ridged exterior for maximal protection. An integrated TSA-accepted combination lock enables to secure your luggage using your own 3-digit code and allows the Transport Safety Authority (TSA) to open your luggage using a special key, without damaging it. The main compartment of this carry-on size spinner is expandable for maximum packing flexibility. This feature is great when packing souvenirs on return journeys! The interior includes two full packing compartments with a lined divider and tie-down straps to secure your belongings. If your bag is overstuffed, it may not be approved for carry-on use by the airlines. This bag features double spinner wheels for superior maneuverability and maximum comfort. It is also equipped with soft-touch top and side carry handles that are convenient when lifting a fully packed case. The telescopic handle locks into two positions to accommodate two or four wheel use.