Netpack Standing UP Travel Wheeled Duffel (Black) Made of 1680D Ballistic Polyester material with moisture resistance laminated vinyl. Incomparable inner fram design for shape holding and none tipping over while standing. Extended 15" wide track base with polyurethane wheels quiet and long lasting rolling for professional traveler. Lightweight polycarbonate bottom frame extra strong structure reinforcement. One generous main compartment with Heavy duty zipper.