... color and size is available 3) strict quality control:ISO 9001 2000 high quality trolley backpack 1)Lining: Five-beauty satin ... high quality nylon fabric, high strength, stretch-proof, hard to twist, can be repeated to pull thousands times. 3)Trolley: Aluminium ... alloy trolley, which produce standard, can bear about 60kgs pressure, well-designed, more durable. 4)Wheels: Using high quality ...