The quality is hard, zipper is used to close the surface, and surface is not easy to be scratched by the knife, the knife can also be well prevented from slipping from the inside during transportation, which is safer.he zipper pull head is made of alloy material, which is not easy to break. The most important thing is that the zipper is smooth and not stuck. The hand strap is also made of high-quality and durable materials, with a suitable width, strong and easier to carry.