Secondly, the nozzle bag has unique functions.  The most prominent is that it has designed a suction nozzle that can be switched repeatedly, so that users can conveniently control the entry and exit of the items in the packaging bag.  The nozzle bag usually adopts vacuum sealing technology, which can extract the air in the package, thus effectively extending the shelf life of the product.  Compared with traditional packaging bags, it is more fresh-keeping and leak-proof.In short, the spout bag is a packaging bag with unique materials, functions and uses.  It can not only effectively protect the items in the package, prolong the shelf life of the product, but also facilitate the user's access and use.  As people's requirements for packaging quality and convenience continue to increase, spout pouches will become one of the important development trends in the packaging industry in the future.Suction bag has a wide range of uses. First of all, it is widely used in the food industry. For some perishable foods such as coffee beans, nuts, dried fruits, etc., the oxygen absorption of the nozzle bag is adjusted moderately, which can maintain the freshness and taste of the food. Secondly, the nozzle bag is also widely used in the packaging of cosmetics, daily necessities and medicines. Due to its good sealing performance and transparency, it can effectively display the appearance of the product and maintain the original quality of the product.