Portrait-Style Double Window Envelope, Moisture Seal, 9-1/2" x 11-1/2", Pack of 50

First class catalog mailers offer a wide variety of mailing options. This particular double window envelope has a portrait catalog orientation for the documents to be inserted, with the flap opening on the short side. Double windows simplify mailing by printing the cover sheet and having both the recipient address and return address show through the envelope windows. This envelope has a remoistening seal, as well as first class mail and a diamond border imprinted in blue, instead of green, on the envelope. Double window first class mailer envelopes measure 9-1/2" x 11-1/2" and open on the short side.