This 4-piece luggage set comprises 16-inch, 20-inch, 24-inch, and 28-inch suitcases constructed from ABS. The 24-inch and 28-inch cases offer a 20% volume expansion, while the entire set nests together for storage. Mobility is handled by 360-degree spinner wheels, and security is provided by a TSA-approved lock with a size 10 zipper.