The CDA materials used in this study included formulated films (1 mil, 5 mil, 10 mil thicknesses), a film (10 mil thickness) formulated like the others but with the addition of 15 wt% CaCO3 filler, a formulated medium density foam (30 mil thickness), and two formulated low-density foams (98 mil and 115 mil thicknesses). The 1 mil CDA film was prepared by solvent casting, while the 5 and 10 mil CDA films were prepared by melt extrusion. The CDA materials were formulated with a nontoxic, biodegradable additive commonly used as an ingredient in processed foods. All CDA materials were provided by Eastman. Details on the materials can be found in published patents. PS foams included a medium-density foam (30 mil thickness) and two low-density foams (75 mil and 150 mil thicknesses) provided by Eastman. All foams were thermoformed. The molecular weight, and thermomechanical and physical properties of the CDA films and CDA and PS foams are summarized in Supplementary Tables . Other materials included a biaxially oriented PP film (2 mil thickness) sourced from Goodfellow (PP30 grade), a PLA film (10 mil thickness) provided by Eastman, and a low-density grade, thermally upgraded kraft paper (10 mil thickness) sourced from the Cottrell Paper Company. PP and PLA films and PS foams were used as negative controls, and kraft paper was used as a positive control.