Polyethylene Coating: A thin layer of polyethylene on both sides presents durability. The outer layer protects the look and printing, though the internal layer functions as a sealant, generating the carton fully leakproof. The first patents for food stuff paperboard containers date back to the beginning of the final century. https://waterinpaperbottle.fitness.blog/2025/07/06/get-water-in-gable-top-cartons-with-custom-branding/