What is the difference between a waterproof backpack and a regular backpack?

The weather in summer changes as quickly as turning the pages of a book. It can change at any time. When you go out, the biggest fear is the storm coming at any time. It’s okay if you get wet. If important documents, electrical appliances, etc. in your backpack get wet, you will lose a lot of money. But not a little bit. Therefore, it is particularly important to have a waterproof backpack. So, how does a waterproof backpack become waterproof? What is the difference between a waterproof backpack and a regular backpack?
 

1. Material differences
The biggest difference between waterproof backpacks and ordinary backpacks is the choice of materials. Ordinary materials become wet when exposed to water. Some materials are waterproof, that is, a coating is added to the material to block some rainwater from entering, but it is of no use if it rains heavily. Moreover, the coating material has a certain service life, but it will become scrapped over time. Most of the materials used in waterproof backpacks are either air-impermeable or breathable but not water-permeable. The coating is thicker and there is even a film on the other side for better waterproof performance.

2. Differences in production technology
The production process of waterproof backpacks is more complicated than ordinary backpacks. Many fully waterproof backpacks require molding during production. The most common ones are some hard-shell backpacks, which use mold-opening technology, while ordinary backpacks basically only require traditional sewing processes.

3. Differences in accessories
Whether it is a waterproof backpack or an ordinary backpack, the manufacturer's opening method is zipper opening, which involves the choice of zipper accessories. For ordinary backpacks, choose ordinary zippers, which are not waterproof and non-breathable, while for waterproof backpacks, choose zippers that are waterproof and will not get wet. It is non-permeable and protects the contents inside more effectively. There are several ways to open a waterproof backpack: generally, the roll opening is used, that is, the bag mouth is aligned and then folded and fixed with buckles or other components to achieve a sealing effect. The other is a bayonet-type sealed bag mouth, which is mostly used for small waterproof bags, but is not practical for large waterproof bags. Another type is the airtight zipper opening. An airtight zipper is a waterproof zipper with a higher waterproof level. This kind of zipper is expensive and is generally used for high-end waterproof backpack openings, outdoor ice bags, waterproof waist bags, etc.