Backpack waterproof knowledge

A traditional waterproof backpack is a traditionally sewn bag with some minor repairs, such as increasing the inner coating of the fabric or adding adhesive tape to the zipper. In fact, water cannot be prevented. It is rainproof and water repellent. Yes, you should add a rain cover if it rains moderately or heavily. The biggest problem is that the material and the mouth of the bag cannot be waterproof for long periods of time.

A mid-range waterproof backpack. This type of backpack has rolled pocket openings instead of zippered pocket openings. To achieve the purpose of sealing, the rolled opening is folded and then physically pushed out. Waterproof performance is approximately 1 to 5 meters deep, 30 minutes waterproof level, IPx6 to level 7. Although it uses TPU laminate fabric and PVC mesh material, the problem with this backpack's waterproofness is that you can't keep the bag's mouth pressed for a long time. Temporal. During use, the bag is constantly deformed by external forces, resulting in a rounded opening. There is a high risk of it coming loose.

High-end waterproof backpacks with airtight zipper pockets utilize advanced airtight zipper seal technology to achieve waterproofing goals. The material is TPU laminate fabric with double-sided tape and the zipper is airtight. This basically solves the problems of the above two waterproof backpacks, and the waterproof level reaches IPX8.