Constructed of 2-tone polycarbonate, this Nema 3-piece set of polycarbonate expandable bags from Olympia USA has lots of upscale features. The set features jumbo 8-wheel spinners with reduced noise and smoother glide, high-quality aluminum locking handle system, built-in TSA 3-dial lock system, buckle tie-belt to secure clothing and detachable clear vinyl wet zip pouch.