★The hard shell luggage cover with rotating wheels is made of environmentally friendly PP (polypropylene) material, which is stronger, lighter, and more impact resistant than ABS and PC materials. It is an innovative material in the hard luggage industry. Using texture processing to prevent cracks and scratches, keeping the box aesthetically pleasing after travel.★20in24in28in are all expandable, adding 25% space capacity for hardshell luggage★Silent & smooth multi-directional spinner wheels for 360 degree effortless movement,the suitcases with wheels easy to turn around tight corners and over bumps, even on carpet. Multi-stage ergonomic aluminum telescoping handle could make you adjust the appropriate step according to your height while you're waiting in line or killing time.★The suitcase set include 3 piece luggage,20inch travel suitcase is best carry on luggage for airplane,another 24inch suitcase and 28inch luggage are need to be checked into the hold when you fly.3 different sizes can meet your travel needs at different times or planned family trips.The smaller trally cases can fit inside the larger one for storage when not in use, just like a russian stacking doll.★Aesthetic appeal - This fashionable and modern design enhances the visual appeal of any usage scenario. Its compact size and versatility allow you to maximize your use even in limited space.