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#10 Business Envelopes with Security Tint and Secure Seal
It’s no secret that #10 security envelopes are the workhorse of business mailing, and we’ve designed our standard #10 envelope to keep your documents safe and secure behind a strong permanent seal throughout transit. Our most popular business envelope is made from a durable 24lb white wove paper and comes equipped with a low profile flap design. Easily fold and stuff up to 10 sheets of standard letter size paper inside with room for a #8 or #9 return envelope – so you can make it simpler than ever for your clients to quickly return payments to you. And with our dark security tint lining the inside, your confidential mail will stay concealed and secure all the way to its destination. It’s an envelope choice that’s 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 #10 Business Envelopes
nicole dee
August 26, 2025
Great purchase for the pricing. Not flimsy or see thru.
Lane Wilkins
August 15, 2025
No complaints very functional quality envelopes
Blackrose0409
August 5, 2025
This was just what I was looking for and for a great price!
eileen schaefer
July 24, 2025
They look to be fine.
Tony Ryan
June 3, 2025
Easy to close security envelopes (no licking required) and a good value for the price.
V vet
May 19, 2025
Paper is a tad thin but I couldn’t make out what the contents had printed on it so it’s ok.
Dennis
May 16, 2025
Good quality good office envelope
LSL308
April 21, 2025
I live in a travel trailer. If you know anything about travel trailer’s, then you know that they hold humidity in really well. My first winter living in this trailer, all of my regular envelopes sealed themselves due to the high humidity in my trailer. So I had to buy envelopes that wouldn’t seal themselves. I lost a lot of envelopes because of this. The new envelopes that I bought are simple and easy to use. Plus, they don’t seal themselves in my humid trailer. These new envelopes work great in my environment!
Linda P
April 18, 2025
I used these envelopes for mailing out tax receipts. Perfect choice with the adhesive strips andthickness of the paper.
caphgi
March 14, 2025
a good product at a reasonable price
J-man
February 3, 2025
High quality paper. Good size adhesive strip. All for a good price
Donat Lavigne
January 24, 2025
Good stuff.
Carole G.
January 17, 2025
I haven't used many ngbut so far they are great envelopes
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