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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
Customer
August 29, 2025
Self adhesive envelopes that work good for QuickBooks invoices and statements.
Larry Pruett
August 5, 2025
Great price, easy to seal self adhesive envelopes..
Bill Wright
July 28, 2025
This is a great product and at a very reasonable price. As a small membership-based nonprofit we send out an acknowledgement for every donation received. Having a quality #9 double window self seal security envelope has eliminated the need for hand addressing or generating mailing labels. Our logo and up to 4-line addressing fit the windows perfectly. The benefit of all the time saved and the professional look easily justifies the cost of the product.
Cecilio Elicier
July 15, 2025
It exceed my expectations
KatieB
June 19, 2025
These envelopes are exactly what I was needing as far as size/windows and having self adhesive strip. Gave it 4 stars because the adhesive remains on the removable strip and will leave sticky residue on whatever surface you leave them on. So, make sure you throw the strip in trash with a liner immediately after removal. Adhesion is good and quality of envelope overall is good.
B H
May 14, 2025
I won’t use any other envelope. So easy to use for billing.
Martin
May 4, 2025
We needed this size envelope and these fit the bill and arrived the same day.
gladys
March 17, 2025
Best fit for Intuit invoices!
J
February 20, 2025
Perfect for invoices and checks.
steve
November 13, 2024
Windows are too big
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