PVC (Polyvinyl Chloride) is highly popular in the waterproof bag purchasing market due to its excellent waterproof performance, durable and tough characteristics, and relatively low cost.
✦ The PVC (PVC tarpauling) material is usually applied as a coating on the base fabric (nylon, polyester), with a combination of 30-40% base material and 60-70% PVC coating on both sides, which balances strength and waterproofness. It is highly processable and can make the waterproof bag seams completely waterproof through high-frequency welding and heat sealing processes, making it particularly suitable for rainy days, water activities, outdoor exploration, etc.
✦ However, there are obvious drawbacks to PVC material: it is non-renewable and non-biodegradable, and there are environmental concerns.
✦ In terms of cost: the raw materials are readily available and it is the cheapest among the five materials.

TPU (thermoplastic polyurethane) is gradually becoming the new industry standard in the waterproof bag field. It achieves a good balance among elasticity, transparency and environmental friendliness.
✦ The TPU material has extremely strong elasticity and waterproof properties. It is resistant to drops and bending, and has high transparency, maintaining excellent touch sensitivity and almost not affecting the user’s operation experience. These characteristics make it particularly versatile. The transparent parts of waterproof phone pouch and visible window dry bag on the market all use TPU.
✦ The disadvantage of TPU is that it is expensive and prone to decomposition at high temperatures, and its strength and hardness are relatively low. Therefore, it is necessary to fully utilize its advantages while overcoming its disadvantages to better meet the product requirements of waterproof bags.
For long-term outdoor use (such as rainwater collection barrels, beach water bags), it is more suitable for travel bags, hiking backpacks, cycling waterproof bags, etc.
✦ Its cost is higher than PVC, but it can bring users a better experience.

The waterproof bags made of nylon fabric usually adopt a composite structure of outer nylon fabric and inner waterproof coating, combining both texture and waterproof function.
✦ The nylon material fibers are soft yet tough, and perform exceptionally well in terms of wear resistance and tear resistance. It is usually combined with PVC/TPU coating as the base material. It is an ideal choice for manufacturing load-bearing bags (such as travel bags, backpacks, swimming floatation, military bags). Moreover, it has good plasticity and is worth considering for purchasers whose target market consists of high-end outdoor users or those who pay attention to product design.
✦ From a cost perspective, the price of nylon material is higher than that of polyester fiber, but it can enhance the product’s grade and support a higher pricing strategy.

Polyester is mainly used as the base material for waterproof bags in the field of waterproofing.
✦ It has features such as high strength, anti-wrinkling, low shrinkage, and good elasticity. When combined with PVC or TPU, it forms a composite fabric. This makes it an ideal fabric for waterproof bags that can withstand harsh environments and be used frequently without wearing out.
✦ However, the disadvantage of Polyester is its poor breathability. Therefore, when we use it to manufacture backpacks, we always add a breathable carrying system. This not only reduces the burden on the shoulders but also makes it more comfortable and breathable when it fits the back.
✦ From a cost perspective, Polyester, as a mature synthetic fiber, has a relatively stable price, a mature supply chain, and is conducive to cost control for purchasers.

RPET (Recycled Polyester) is made from discarded plastic bottles and involves processes such as sorting, crushing, cleaning and granulation. It is an outstanding representative of sustainable materials in the field of waterproof bags.
✦ In terms of performance, recycled PET is comparable to traditional polyester in terms of strength and durability, still maintaining the high strength, abrasion resistance and dimensional stability of polyester fibers. With the increasing environmental awareness, waterproof bags made of RPET materials have special appeal to consumers with strong environmental consciousness.

✦ Although the cost of RPET is usually slightly higher than that of virgin polyester, its environmental advantages can support a higher product premium and meet the sustainable development requirements of an increasing number of brands.

✦We have also obtained the relevant environmental certifications from the international RPET community.