How Is A Waterproof Backpack Made?
You can spot a waterproof backpack by its special materials and design. Makers use strong fabrics like PVC, TPU, nylon, and polyester. These fabrics keep water out and last a long time. Coatings like PU or PVC give extra protection. Seam welding gets rid of stitch holes, so water cannot leak in. Roll-top closures and...
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