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Your cart is empty.Columbian #9 Double Window Envelopes with a SimplySafe security seal are ideal for mailing important documents or sending sensitive client information. Each security tinted envelope has a scrambled blue pattern printed on the interior that conceals the contents. The patented SimplySafe seal is constructed to show any signs of tampering. These business envelopes are still easy for the sender to close and the intended recipient to open. The Release & Seal strip peels right off so you can press to seal without any moisture. A pull strip makes opening the envelope straightforward and prevents you from tearing the documents inside. These #9 self seal envelopes are inkjet printer compatible, though not recommended for a laser printer (use address labels instead). Stock up on number 9 security envelopes for billing paperwork, tax documents, accounting records and more. Double window envelopes show sender and receiver addresses; top window is 7/8" x 3 1/2"; 3/8" from the left; 2" from the bottom; bottom window is 1" x 4"; 3/8" from the left; 1/2" from the bottom. Overall envelope dimensions are 3-7/8 x 8-7/8 inches. White. Box of 500.
Michael Borden
August 6, 2025
I work in medical billing and we go through a ton of these two window envelopes. And they are cheaper here than anywhere else we looked. Great product!
susan lynn belanger
June 8, 2025
awesome
DangeRuss
June 7, 2025
Safe, self stick, zip open and fits my statements perfectly. 500 at a good price. Exactly what I needed.
MARTINA
April 25, 2025
Quality good. Bought for the office checks. I will buy again
kandk
April 21, 2025
These are great envelopes for mailing invoices or payments. Compared to the cost of going to an office supply store, these are about 1/2 the cost. The security envelope feature is perfect, you can't see through even when held to the light and the self seal works very well too.
Randall M. Rueff (K9RMR)
March 11, 2025
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Jerry Stigliano
March 8, 2025
I always think envelopes are overpriced but these are great. The self-adhesive seal works like a charm every time. They fit my checks and invoices with ease. They look good and professional. The windows are easy to line up and bigger than some others which I like best.
Mike N.
March 3, 2025
Nice envelopes way cheaper than most places
Sandra Gilbert
February 26, 2025
Envelopes arrived early, which was great. The quality if excellent.
Garth
February 15, 2025
Great quality at a fraction of the price of big box stores
Happy Face
February 7, 2025
Unfortunately the upper window can reveal the amount of a printed cheque if the cheque shifts toward the top of the envelope. The strip between the windows is too narrow. Also the height of the lower window is so low that sometimes you can't see the first line of the printed address (the addressee's name). Won't buy this product again.
Arti
January 5, 2025
the bottom window location is not appropriate for checks. Do not show the mailing address in full. Need to be placed 1/8 inches higher
KC
December 31, 2024
windows were off by one line - it would have helped with measurements
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