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


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

The weather in summer changes as rapid as flipping through a book. The most fearful is the storm coming suddenly, if the important documents and electronic products in the backpack get wet, the loss would not be a little bit, so it's very important to have a waterproof backpack.

What kind of backpack can be called waterproof backpack? What is the difference between a waterproof backpack and an ordinary backpack? Let's listen to Worthfind's brief description.

We often go into a misunderstanding and think that it is the difference only in materials. In fact, in addition to the difference in materials, there are huge differences in processing technology.

1. Material difference

The biggest difference between a waterproof backpack and an ordinary backpack is that in the material selection, the ordinary material gets wet when it falls into water. Some materials have the function of water repellence that is a coating added inside the material to block the entry of some rainwater, but if encountered heavy rain it would be useless. Most of the materials used in waterproof backpacks are airtight or breathable, and its coating is thicker and the other side is even filmed. It has better water resistance and can withstand more than one atmosphere. If it is thicker, such as TPU film, 0.12 heavy pressure laminating film can withstand 2 atmosphere pressures.

Waterproof materials mainly include: TPU laminated cloth, which is an environment - friendly material with a wide temperature resistance; the other is PVC mesh, which is widely used with a low cost, but with narrow temperature durability range.

Waterproof backpack

2. The difference in production process

The waterproof backpack production process is more complicated than the ordinary backpack, and the traditional backpack material joint can be achieved by the traditional process of sewing. The material of the waterproof backpack needs a mold for heat seal by a high-frequency welding machine

To make a waterproof backpack, it requires enough order quantity. The power level of the high-frequency machine decides the mold sizes. The bigger the mold, the higher the power required, and the more expensive the machine.

3. The difference between accessories

Regardless of the waterproof backpack or the ordinary backpack, as long as the opening method is zipper, it involves the selection of the zipper accessories. The ordinary backpack selects the ordinary zipper, which is not waterproof and breathable, and the waterproof backpack selects the waterproof and water-resistant zipper, which can protect the contents in the bag more effectively.

There are several opening ways for the waterproof backpack: generally, for the rolled opening, you can make the bag folded and then fastened with a buckle or other components to achieve the sealing effect. The other is a bayonet type seal, which is used for small waterproof bags. Another type is the airtight zipper opening. The airtight zipper is the highest waterproof level. This zipper is costy and is generally used for advanced waterproof backpack, outdoor ice packs, and waterproof waist packs.

Waterproof fabrics are commonly found in backpacks in the following categories

First, compact fabrics, such as 210D nylon-1000D nylon, are still widely used in high-end backpacks such as Osprey, GREGORY, Bigpack (using CORDURA fabric, and also a nylon) because they are tear resistant and has a certain water- repellent performance.

Second, the natural wax (Greenland Wax) coated fabric, such as Fjallraven G1000 developed exclusively by the Swedish Arctic fox in 1968; it is made of long fiber cotton blended fiber, without any chemical film, but on the surface of the fabric a natural wax (Greenland Wax) for excellent water repellent properties.

Third, the DWR coated fabric, on the surface of the waterproof backpack fabric with PTFE micro porous film and Sympatex breathable film; we can see that the water forms small water drops and then slip. This is to add DWR (Durable Water Repellency) when the fabric is shaped, so that the water dripping onto the surface of the fabric gathers to form small water drop, or slide directly off the surface to prevent the fabric from absorbing moisture. The waterproof bag made of water-repellent fabric is water-repellent.

Fully waterproof fabrics are commonly found in backpacks in the following categories


1. PVC mesh mixed fabric, such as PVC 500D, PVC 600D, PVC1000D.

2. Nylon TPU laminated fabric, such as 210D nylon TPU, 420D nylon TPU, but the waterproof fabric does not mean that the bag made by it is waterproof. If use waterproof fabric, but by traditional sewing and ordinary zipper, due to the gap between the needle holes and the zipper at the seam the bag cannot be 100% waterproof, and it can only be defined as water repellent  bag.

3. How to achieve a full waterproof backpack? First, use a fully waterproof fabric such as N400r-AC2 plaid fabric or Waterlock nylon plaid fabric, followed by seamless hot seal welding at the seams of the fabric, and finally the zipper should be replaced by a roll-over method or a fully waterproof and airtight zipper. Since the waterproof fabric is difficult to manufacture, and the hot seal welding technology is not popular, the price of the fully waterproof hiking backpack is high, and it is a scarce commodity. This kind of backpack has the characteristics of tear resistance, super wear resistance and being waterproof for heavy rain. With the continuous improvement of living standards, it is believed that more and more outdoor enthusiasts will love and use the fully waterproof hiking backpack.

The above is a brief introduction from Worthfind about "Where is the difference between waterproof backpack and ordinary backpack?" If you want to know more about waterproof backpacks, please feel free to contact. Worthfind specializes in bags and luggage more than14 years, you will find what you desire and get full satisfaction!

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