4 1/2 x 5 1/2" Environmental "Packing List Enclosed" Envelopes. Pressure sensitive packing list envelopes secure and protect documents that are attached to the outside of shipments. These "green" envelopes are made from 100% recycled green tinted polyethylene and are manufactured using solar energy. Pre-printed with the recycled content and renewable energy statement. Hot melt adhesive backing provides strong adhesion to paper and corrugated products. Envelopes open along the first dimension.