When mailing, packing and shipping products, it's important to keep a record of the included items, so there's no confusion over what's been received. Packing list envelopes allow you to easily share this document with your customers without worrying about them getting crumbled. Pressure-sensitive adhesive backing attaches securely to almost anything - paper, wood, plastic or metal. Fast, simple application - simply peel off the reversible tape and apply to the package.