Postal stationery

The term "Postal stationery" refers to envelopes and postcards sold at post offices which already have prepaid postage at the domestic first class letter or postcard rate stamped onto them.

Postal services of some countries also offer a product called an "aerogramme" consisting of a blank sheet of paper with folding instructions and adhesive flaps that becomes its own envelope, and carries prepaid postage at the international airmail letter rate.