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    A truly waterproof backpack uses coated fabrics (PU or TPU), welded or taped seams, and a sealed closure system, either a roll-top fold or a TIZIP-style airtight zipper, that prevents water from entering the main compartment
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    Knack Bags use custom-designed exterior fabrics with water-resistant surface finishes and a PU coating on the back This combination improves durability, helps repel water, dirt, and stains
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