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As far as I know, the nutrition of pasteurized milk is the best, but the shelf life of this kind of milk is relatively short, only a few days, so it is relatively rare in China and more abroad. In China, high temperature sterilization is often used, which has a long shelf life. However, filial piety kills harmful bacteria as well as bacteria beneficial to the intestine. This is what I'm looking for. The fresh milk (tetra pak) packed in paper bags tastes good, and the shelf life is: tetra pak pillow for 45-50 days; The fresh milk packed in Tetra Pak Brick Plastic Bag (Bailey) for 6 months tastes bad, often smells like plastic bags, and it is easy to be bitter (I have encountered bitter taste when milk goes bad), and the shelf life is 30 days. . As far as I know, the nutrition of pasteurized milk is the best, but the shelf life of this kind of milk is relatively short, only a few days, so it is relatively rare in China and more abroad. In China, high temperature sterilization is often used, which has a long shelf life. However, filial piety kills harmful bacteria as well as bacteria beneficial to the intestine. This is what I'm looking for. These are two different packaging forms. Paper packaging is called tetra pak. The difference between these two packaging forms will have different requirements for processing technology. What you said is thicker, but the milk packaged by Tetra Pak is fresher. Processing and packaging time is short. The price difference is due to the different packaging costs. Tetra Pak's packaging has been patented. In China, he is the only one ... You can compare the ingredients yourself: there is no difference in quality if the varieties are the same. The difference lies in the packaging material. For example, cola: canned (expensive materials, so high prices) and bottled (reusable, so cheap) milk are the same. Tetra pak pillows have fewer layers of materials, so the shelf life is relatively short. The price is cheap. Tetra pak. The nutrients are the same. But they are handled in different ways. Paper bags are generally sterilized instantly, while plastic bags are pasteurized. Therefore, the shelf life is different, paper bags are generally 45 days, and plastic bags are shorter, 30 days. . Plastic ... cartons have higher density and are more conducive to nutrition and preservation. Of course, some are expensive and easy to carry. Simple packaging is economical to use at home. It's all the same, but the packaging is different, and the paper bag packaging cost is high. Sound insulation materials are generally heavier materials, and the heavier materials have high density and sound is not easy to penetrate, so I choose foam plastic, which is thicker/hehe! Spray k- 18 is a sound-absorbing material of sound-absorbing fiber.