Customized backpack waterproof zipper to prevent waterproof
I often hear customers say that custom-made backpacks should be waterproof, emphasizing the use of PVC bottom materials, and then the need for waterproof zippers. We all know that the fabric of pure PVC bottom is waterproof without stitching or cutting, but backpacks are all waterproof. It needs to be sewn. Even if the fabric…