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What Is Waterproof Backpack
Aug 03, 2017

Waterproof backpack first material waterproof in the special production process, the material can be divided into TPU `PU` PVC three categories. 

If you do not see the traces of the needle and thread, you can conclude that the use of "seamless welding technology," the so-called seamless welding technology is between the material through the high-frequency voltage from the new adhesive together. 

And the design of the pocket to roll and waterproof zipper-based, to achieve waterproof effect. A good waterproof bag in swimming can be used as a life saving bag.