Polyethylene Coating: A thin layer of polyethylene on either side gives sturdiness. The outer layer protects the look and printing, when the interior layer acts being a sealant, earning the carton totally leakproof. The main patents for food items paperboard containers date back to the start of the final century. https://paperbottle.fashion.blog/2025/04/09/revolutionizing-product-packaging-with-gable-top-containers/