... wrinkle fabricinsidelining with laptop pocket and document compartmenttrolleyaluminium alloy trolley , bearing wheelspackingeach bag with a poly bag , ... nylon fabric , high strength ,stretch-proof ,hard to twist ,, Trolley: produce standard ,well-designed , more durable .Wheels : use ... wheels, stainless steel axletree make it more bearing ,rolling smoothly , be ware you no fear of trouble ...