9" x 12" 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. Classic, open-end envelopes store letter-size papers and photographs without folding or larger, folded items. 9" x 12" size is perfect for workbooks, manuscripts, booklets, sales literature, certificates, contracts or other large or heavy enclosures. Wide, heavily gummed commercial flap seals tight with moisture to keep bulky inserts secure. Center seam adds strength for heavy contents. Store your gummed catalog envelopes in a cool, dry place for impressive longevity.