 Paper (70%) provides the stiffness, strength, and the efficient brick shape to the package.Low-density polyethylene (24%), the most common plastic used for aseptic packaging, located on the innermost layer forms the seals that make the package liquid-tight.Aluminum (6%) is located on the inside of the aseptic package, forming a barrier against light and oxygen, thereby eliminating the need for refrigeration and preventing spoilage without using preservatives.