Polyethylene Coating: A skinny layer of polyethylene on either side offers durability. The outer layer safeguards the design and printing, though the internal layer functions as being a sealant, building the carton absolutely leakproof. The 1st patents for foodstuff paperboard containers date back to the start of the last century. https://cartongabletop.car.blog/2024/09/12/the-rise-of-gable-top-packaging-solutions/