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#9 Business Envelopes with Security Tint and Secure Seal
A standard security envelope that’s ideal for everyday business use, our #9 mailer is made from durable 24lb white wove paper and keeps your documents safe and secure with a strong glue seal and dark security tint lining. This envelope is equipped with a low profile flap design, making it easy to fold and stuff up to 10 sheets of standard letter size paper inside with room for a #8 return envelope so your clients can quickly return payments. It can also be used as a return envelope itself when sent inside a #10 envelope, making the #9 one of our most versatile envelope choices, simple enough for everyday letters and statements, yet professional and secure enough for high-profile business communications.
Blue Summit Supplies Secure Seal Types
Peel & Seal!
Simply pull the backing off the envelope's flap to reveal an adhesive strip that can be folded over and pressed down to seal contents safely inside.
Gummed!
Moisten the strip of adhesive found on the envelope's flap and fold over to seal contents securely inside.
Flip & Seal!
No moisture is required, just flip up the bottom flap, fold over the top flap and press to secure contents safely inside.
- Secure Closure Types: Gummed, Flip & Seal, Peel & Seal
- Industry Standard Durable 24lb White Wove Paper
- Cross-Hatch Security Tint Keeps Contents Concealed
Compare Blue Summit Supplies #9 Business Envelopes
William Willett
August 22, 2025
The value was good, I use these for members of my group to return their yearly renewal cards
aholic
August 17, 2025
I use these at work for mailing out full sized company checks. These are easy to open, close, seal. Sturdy and secure, no seeing through the paper at all. I prefer the single window security envelopes, as my experience has been that two windows sometimes allow more of the face of the check to be seen and I prefer as much confidentiality as possible when mailing checks that are partially visible.I don't lick envelopes anymore, (sanitary/health cautions), and use a bottle of envelope moistener with adhesive in it and these stick super well without any corners lifting up.
MamaP
August 7, 2025
Great value and a nice envelope. Fit QB checks.
Bailey
June 26, 2025
The pork tab remains sticky as you peel it from the envelope and the glue sticks to your fingers
Brenda Garcia
June 12, 2025
Great for basic business. Not super thick so you can still see through in the light. For everyday basics, this is the perfect inexpensive envelope.
All Season Lawn Landscaping
June 10, 2025
Good quality
Jane Kirsch
April 4, 2025
I use them to mail checks and they fit correctly.
Chris von Stein
February 5, 2025
They looked fine, except the window on the envelopes I got were about 65% of the width, so I returned them. The picture here shows a window that is about 50% as wide as the envelope.
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