Ultra-Lightweight Travel Case The Airox Medium Hardside has innovation built into its DNA. First up it’s the lightest weight luggage on the global market. Secondly, it’s constructed from 100% pure virgin polycarbonate, a directional super durable material. Thirdly, it features 60 mm dual-caster wheels for 360° maneuverability and zero weight in hand. Add to that Lisof Silent Tires and Hinomoto wheels, and it’s a feat of specialized Swiss engineering.