Pre-labeled waterproof packing Envelopes - packing list - 4.50&Quot; width x 5.50&Quot; length pre-labeled Envelope features a waterproof and oil-proof design to ensure your package is secure. Front is printed with " packing list enclosed.&Quot; self-adhesive offers a quick and easy way to seal your package without the need to moisten. Top layer is made of an LDPE 30 micron adhesive. Pressure-sensitive backing attaches securely to almost anything - paper, wood, plastic or metal.