Durable Polycarbonate Shell: Lightweight, water-resistant, and impact-resistant for lasting use. Expandable Storage: Set of 3 with 58cm (55L to 67L), 68cm (88.04L to 101.7L), and 78cm (126.75L to 150.15L) for versatile packing needs. Silent 8-Wheel System: 360° spinner wheels ensure smooth and effortless mobility Organized Interiors: Wet pouches, adjustable straps, and compartments for neat packing. 3-Year Warranty: Enjoy peace of mind with a comprehensive 3-year warranty that protects your luggage from manufacturing problems