... Any color and size is available 3) strict quality control:ISO 9001 2000 high quality trolley backpack 1)Lining: Five-beauty satin, ... with logo printed, beware of imitation. 2)Zipper: Using high quality nylon fabric, high strength, stretch-proof, hard to twist, can be ... 60kgs pressure, well-designed, more durable. 4)Wheels: Using high quality PVC wheels, stainless steel axletree make it more bearing, ...