We have announcements that we needed mailers for. Something that would protect the contents through the mail. These mailers have a lining of bubble wrap inside that will do just what we want. I would address the envelopes or apply your address label before adding the contents. The paper covering is a bit thin and my fear was breaking through the paper while addressing. To avoid this and make things easier we have purchased mailing labels. The size is exactly perfect for fitting our custom made envelopes.