Lightweight durable Polycarbonate ABS Shell material for strength and provide maximum impact resistant The Polycarbonate allows the shell to absorb impact by 'flexing' when under heavy stress The ABS is then added to give the shell greater rigidity so that it will not permanently deform when under pressure but instead 'pop' back up into its original shape Internal push-button aluminum handle system Top and side carry handle for easy lifting Four multi-direction Spinners Wheels for effortless rolling on 24? and 28? uprights 20? Upright wheels are located on the outside edge of the luggage to provide greater stability and control when rolling over rough Full interior lining Spacious main compartment provide ample packing space for your travel need Internal zipper packets and town-down strips Includes One official TSA Lock w/ 2 keys