ABS Hard Shell: The material has excellent wear resistance and impact resistance, and is lightweight. Durable luggage can withstand transportation and keep your belongings safe. Lightweight luggage makes traveling effortless and enjoyable. Expansion 25%: Only for 24/28-inch suitcases. Luggage expansion adds 25% extra space, so you can bring back even more souvenirs. 24-inch and 28-inch suitcases have TPE reinforced handles on the top and sides for easy carrying. TSA Approved Lock: Each travel luggage comes with 3-dial TSA approved combination lock to better protects your property and facilitate customs clearance. Double Universal Wheels: Upgraded spinner wheels are quiet and easy to move, making it easy to navigate through airport halls and streets. Telescopic Handle: 3-level adjustable handle to meet the needs of users of different heights. 28-inch checked luggage size: 18.5*11.6*29.5". Ideal for long-distance trips. HOW TO RESET THE TSA APPROVED LOCK