【Complete 6-in-1 Travel System】 Includes 14" (under-seat personal item), 16" (small carry-on), 20" (standard carry-on), 24" (medium checked), and 28" (large checked) ABS hardside suitcases, plus a multi-functional travel duffel bag. From short business trips to month-long family vacations - you have the right size for every need. 【TSA-Approved Lock & Enhanced Security】 Each suitcase is equipped with a built-in TSA combination lock, allowing airport security to open and re-lock without damaging your zippers. Travel internationally with confidence - your belongings stay safe from curb to carousel. 【Expandable Duffel with Waterproof Wet/Dry Separation】 The included travel duffel bag expands for 30% more packing space. Features a dedicated waterproof compartment perfect for wet swimwear, leaky toiletries, or dirty laundry - completely isolates moisture from your dry items. 【Ultra-Smooth 360° Spinner Wheels & Adjustable Handle】 Double spinner wheels rotate and smoothly 360°, eliminating wrist strain. The telescopic push-button handle adjusts to multiple heights, fitting travelers of all sizes - glides alongside you like a dream. 【Lightweight & Impact-Resistant ABS Shell】 Made from premium ABS material - lightweight yet tough.