ABS Hard Side: 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. 3 Piece Luggage set: 20" is carry-on, 24" and 28" are check-in. They can be stored inside each other, offering more convenience and saving storage space. TSA Approved Lock: Each travel luggage comes with a 3-dial TSA-approved combination lock to better protect your property and facilitate customs clearance. Authorized customs agents can inspect your luggage without damaging the lock, providing enhanced security and privacy protection for your belongings (no keys required). 360° Spinner Wheels & Ergonomic Handle: Quadruple silent spinner wheels glide smoothly in any direction, even on uneven surfaces. The push-button telescopic handle adjusts to 3 heights with cushioned grips, eliminating finger strain when maneuvering heavy loads through crowded terminals. Organized Interior + Bonus Hooks (28"): Features snap-button compression straps and multiple compartments to secure clothing. Exclusive to 28" case: Two external quick-access hooks hold backpacks/coats. 20" CARRY-ON/ 24" 28" CHECKED LUGGAGE, Sets can be stored inside each other. The carry-on size dimensions will meet most airline approved. Size: 20-inch 14.76*8.66*21.65", 24-inch 17.32*10.24*25.79", 28-inch 19.69*11.42*29.72". TSA Lock Included, and fully-lined interior divider with organization pockets, keep your belongings secured and organized in the luggage. Crafted from high-quality ABS material, our luggage is not only lightweight but also incredibly durable. Our suitcase is equipped with four 360° Spinner wheels, allowing for effortless maneuverability in any direction. Two Hooks(Only on 28"): Hangs backpack, computer bag or hat etc.