Sea to Summit Pack Converter nylon Two carry handles, internally reinforced plus removable shoulder strap Tough, waterproof 210D rip stop nylon All seams tape sealed A duffel bag for checking a backpack as luggage Added security when traveling through airports and train stations Two carry handles, internally reinforced plus removable shoulder strap Tough, waterproof 210D rip stop nylon All seams tape sealed A duffel bag for checking a backpack as luggage Added security when traveling through airports and train stations Contoured to fit internal frame packs Reccomended to be used for flying