So glad you asked! A team of experts in design, engineering, procurement, operations and quality worked for nearly a year to perfect the design and manufacturing process. First we tested a clear back option, but ran into manufacturing problems. We concluded that the best option was to replace the bottom panel with transparent material. The new clear bottom is made from a 2-ply laminate. The inner layer (the one in contact with the juice) is the same material used in the current foil laminate structure. The outer layer was added because of its transparency, durable nature and resistance to punctures.