3M Top Print Packing List Envelope PLE-T2 is a 4.5" x 6" polyethylene envelope, top-printed "PACKING LIST/INVOICE ENCLOSED". We designed this side-loading, peel-and-stick envelope with a high-tack rubber resin adhesive that sticks on contact to packages. Oil- and water-resistant, this packing list envelope safely and securely protects documents from damage throughout delivery.