Pre-Labeled Waterproof Packing Envelopes - Packing List - 7.0" Width x 5.50" Length Pre-labeled envelope features a waterproof and oil-proof design to ensure your package is secure. Front is printed with "Packing List Enclosed." 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.