Most thin-film plastic materials are made from the same base material, low density polyethylene (LDPE).
However, the focus of the competition is not on a specific type of thin-film plastic alternative, rather the judging criteria are designed to focus on the qualities of these materials (end of life, production impacts, performance, scalability, and cost).
As noted elsewhere, other materials that are not direct substitutes for thin-film plastic are eligible so long as it is clear that these materials can be utilized to meet the primary use-cases targeted by the prize, namely fashion polybags and single-use and resealable plastic sandwich and storage bags.
