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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
Cindopup
August 7, 2025
I mail out a lot of statements each month and have ordered these same envelopes forever. Great product and price. Easy to use. I like how they’re sent in a box that isn’t flimsy.
JJZ
July 5, 2025
Been ordering these for years to send statements to our patients. They are easy to seal and unseal without the risk of ripping what’s inside the envelope. Great quality for the price.
Tricia R.
June 21, 2025
These envelopes are perfect for my quickbooks checks.
Teresa
June 19, 2025
We go through a lot of envelopes for our business and have tried a handful of different brands throughout the years. Most of them have issues when you peel off the sticker, the adhesive is no longer sticky. These have been performing well but my only gripe is that i wish the adhesion would run the full length of the flap. It makes it very easy to accidentally snag the unsealed portion of the flap and break the seal. These are still much better than peeling it and not being able to seal the envelope, leaving you having to use tape.
Loudspeakerman
May 3, 2025
These envelopes work great for quick books forms. No more licking envelopes. No strips to peel. Just fold and seal. Adhesive is solid and holds well. East to use
joe40511
April 29, 2025
I love the fact they are self stick/seal.
susette stickel-rufer
April 21, 2025
Wasn’t sure about these but really like them for A/P checks from a small company!
Lulu zig
April 13, 2025
Super easy to insert letter and then place invoice and flip and seal flap. Much easier than ones that you must pull off a strip!! Does a large mailing really quickly.
Mystical Distributing Company Ltd.
February 15, 2025
These fit the computer chqs I print much better than the ones I previously bought. They are also quite a bit cheaper than the ones we used to purchase from Staples. I will reorder from here for sure.
May
February 12, 2025
Pour envoyer des comptes de taxes.
TM
February 7, 2025
Great Value and quality
Sarah Tang
December 15, 2024
Same quality as Staple. Recommend for sure
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