Multilayer method: the addition of a plastic movie was step one to generate brick containers impermeable to liquids and heat-sealable. While in the nineteen sixties, an aluminum foil began to be extra on the cardboard container to make sure superior protection and lengthen the shelf life of the packaged solution. https://sustainablewaterpackaging.car.blog/2025/09/23/water-in-paper-bottle-redefining-purity-with-every-pour/