During the manufacturing process of woven bags, the inside and outside of the bag are usually covered with film to improve its water and moisture resistance. As for which waterproofing effect is better between the inner membrane and the outer membrane, it depends on the specific usage and needs.

Generally speaking, the waterproofness of the outer membrane is more important and direct, because the outer membrane is directly exposed to the environment and is directly affected by rain, moisture and other external factors. Therefore, the waterproofness of the outer membrane is essential to protect the contents inside the bag from moisture and humidity. The outer membrane is usually made of polyethylene (PE) or other waterproof materials to ensure that the outside of the bag can effectively resist moisture penetration.

Although the waterproofness of the inner membrane is also important, it is usually more to protect the items inside the bag from external factors. The inner film can prevent the fertilizer, grain and other items inside the bag from being invaded by moisture and moisture, thus maintaining the quality and integrity of the items. The inner membrane is also usually made of polyethylene (PE) or other waterproof materials.

Therefore, taking all things into consideration, the waterproofness of the outer membrane is more critical to the waterproofing effect of the woven bag. Of course, when making the actual choice, you may need to decide the material and waterproof performance of the inner and outer membranes based on your specific needs and use environment to ensure that the bag can effectively protect the contents inside from moisture and moisture.