3 Piece Expandable Set: All the 3 suitcases can expand for extra storage room while needed. The 20" is designed for carry-on, the 24" and 28" for checked. You can pick anyone to meet on an individual trip or family trip. and besides, luggage stacks inside each other for space-saving Quality Material and Durability: Benefits of the hard shell ABS material, the luggage sets are lightweight, durable and sturdy, which is much needed with travel. These suitcases are perfect for carry-ons and long travel needs Easy to Use and Maneuver: The 3-piece luggage set with carrying handles on top and on the side, built-in TSA lock, zipper, and 4 side Feet, makes it easy to use and maneuver. Especially the TSA-approved lock keep your items secure and baggage claim. You can enjoy your travel without any worry Telescoping Handle and Double Spinner Wheels: The 3-step telescoping handle goes up and down and fixes quickly with a push button. The luggage set comes with 4 double spinner wheels that can roll 360 degrees smoothly for easy maneuverability at airports and train stations Spacious Interior Storage: The inside of the suitcase has a full zippered compartment, a mesh pocket, and an X strap to hold folded clothes or other items in place. The roomy space allows to fit a lot of items and organize well