1. Material difference
The biggest difference between waterproof backpacks
and ordinary backpacks is in the selection of materials. Ordinary materials are wet when they encounter water, and some materials have the function of preventing water splashing, that is, a coating is added to the material, which can block the entry of some rain, but it is useless if it encounters heavy rain. Moreover, the coated material has a certain service life, which will not work for a long time. Most of the materials used in waterproof backpacks are airtight or airtight, with thicker coating and even film on the other side, which has better waterproof performance.
2. Differences in manufacturing process
The manufacturing process of waterproof backpacks is more complex than that of ordinary backpacks. Many completely waterproof backpacks
need to open molds when making them. The common ones are some hard shell backpacks, which use the open mold process, while ordinary backpacks basically only need the traditional sewing process.
3. Accessory difference
Whether waterproof backpacks
or ordinary backpacks, the manufacturer's opening method is zipper opening, which involves the selection of zipper accessories. The ordinary zipper selected by ordinary backpacks is not waterproof and breathable, while the zipper selected by waterproof backpacks is waterproof and will not penetrate in case of water, which can protect the contents more effectively. There are several opening methods for the bag mouth of waterproof backpack: generally, the opening is the roll mouth, that is, the bag mouth is folded after being aligned and fixed with a buckle or other parts, so as to achieve the sealing effect. The other is bayonet type sealed bag mouth, which is used for many small waterproof bags, and it is unrealistic for large waterproof bags. Another is the air tight zipper opening, which is a waterproof zipper with high waterproof level. This kind of zipper has high cost and is generally used for high-grade waterproof backpack opening, outdoor ice bag and waterproof waist bag.