6" x 9" catalog mailing envelopes are perfect for shipping, storing and organizing. Heavyweight, 28 lb. Kraft paper withstands extensive handling at home, in the office or on the mail route. 6" x 9" size is perfect for small documents without folding or larger, folded documents. Classic open-end envelopes are great for 6" x 8" greeting cards. Wide, heavily gummed commercial flap seals tight with moisture to keep inserts secure. Center seams provide added strength for heavy contents. Store your gummed catalog envelopes in a cool, dry place for impressive longevity.