Material selection using MIs for several functional indicators and environmental impacts can inform decision-making. Food trays and takeaway containers are formed films and foamed sheets; thus, for eco-informed material selection, MIs for stiff and strong films and sheets were evaluated to compare materials used for these items and potential alternative materials. Indices for material efficiency, material cost efficiency, GHG emissions, energy usage, water usage, and environmental lifetime were calculated for each material (Supplementary Table , Figure ), thereby covering a broad range of functional, economic, and environmental design considerations.