The material of the coffee bag is generally a combination of dumb film and pure aluminum + PE, so that the coffee beans can be protected from ultraviolet rays; the material of pure aluminum foil AL can also greatly resist the intrusion of water vapor and bacteria, thereby prolonging the shelf life of coffee beans; the unique matte frosting effect makes the coffee bag look high-end; the setting of the one-way breather valve is to allow carbon dioxide to be discharged from the bean bag because it is freshly roasted The coffee beans must be exhausted, and to put it more appropriately, it feels like breathing. The function of the air valve is to help the carbon dioxide of the coffee beans to be discharged, so for the coffee beans, the air valve is a device that allows air to flow out but not in, effectively slowing down the aging speed of the coffee beans. The Japanese Sampras zipper is loose on the outside and tight on the inside, allowing consumers to easily open the bag and take out the coffee bag inside. It also allows our coffee bean manufacturers to easily encapsulate coffee beans. Once the zipper is closed, it is difficult for coffee beans to come out of the inside unless you open the zipper.