Self-Adhesive Packing List Envelopes feature a wide variety of standard sizes and styles. They can be custom produced and printed with up to four colors, Packing List Envelopes are made from a blended polyethylene film in clear or white, which has been formulated for superior print-ability. Utilizing adhesives that stick well to cardboard, plastic, wood, glass, and metal, they can hold documents such as packing slips, invoices, warranty information, operation instructions, wiring diagrams and etc.