Delsey Luggage Helium Superlite Lightweight 2 Wheel Carry On Rolling Upright, Black, 21 Inch The lightest weight luggage constructed with Dura-Tec material backed with vapor barrier for long lasting use Fully integrated lightweight memory frame Velocity wheels are recessed and protected provides a smooth and quiet rolling action Concealed Add-a-Bag strap with adjustable webbing allows additional bags to be carried effortlessly Expands up to 2" for additional packing space