The InUSA Chicago collection is proudly assembled in the USA from imported parts using lightweight ABS/PC engineered material with micro diamond finish. Functional style with 4 airplane design dual spinner multi-directional silent 360 degree wheels for effortless mobility. The sturdy construction offers maximum strength. durability and a water/scratch resistant finish. Full interior fabric lining with a zippered compartment on one side. opposite side offers elastic tie-down straps for additional support and an inside pocket. A side mounted 3 digit TSA approved combination lock. push button locking internal retractable trolley system. The small size offers a Top ergonomic GEL handle. The medium and large size offers Top and Side ergonomic GEL handles for comfortable and easy lifting. Smooth running quality oversized number 10 Zipper. Four side studs allows each piece to stand upright on its side.