This luggage set includes three versatile pieces – a 28" suitcase, a 24" suitcase, and a 20" carry-on, making it suitable for various travel needs. The 20" carry-on has a built-in function on the back that accommodates USB ports (battery not included) and a cup holder, providing easy access to essential items during your journey. Equipped with a 360-degree 4-wheel system, these luggage pieces offer smooth and effortless navigation through busy airports and crowded terminals. Each piece of luggage can expand by 2.5 inches, allowing you to pack more items and adjust to your packing needs while ensuring you stay within airline size restrictions.you can trust in the durability and quality of this luggage set, making it a stylish and reliable choice for your travels