500#10 Windowless Security Envelopes Self Seal, Peel and Seal, Security Tinted, Printer Friendly Design for Business, Dimensions - 4-1/8 Inch x 9 ½ Inch - Envelopes Letter Size for Mailing
Inhouse product
- Perfectly fit standard 8.5’’ x 11’’ paper sizes and other large documents like invoices, letters, checks, and more
- Provides complete mail security with dark black security tint that completely hides you mail
- Self seal design that is quick and easy and guaranteed to stay sealed with no need for tape or glue sticks
- Printer friendly envelopes with smooth thick paper saves time and frustration while printing with laser or inkjet printers
- Maintains professional look and feel throughout transit with our durable 24 LB white wove envelope paper
| Brand | Blue Summit Supplies |
| Color | White |
| Closure Type | Self-Seal |
| Occasion | everyday mailing |
| Material | Paper |
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beahan.matilde@hotmail.com
08-03-2026Trop chère
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842210672a@gmail.com
08-03-2026La calidad es excelente.El gran detalle es que el paquete venía incompleto, de los 500 mencionados, faltaron alrededor de 10 sobres.
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qmckenzie@simonis.com
08-03-2026These #10 envelopes are a good item and nice not to lick tab to seal. I use them for bulk mailing and they are good quality. I will buy more as needed.
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ocgalinakimberlyac1004@gmail.com
08-03-2026This envelope is perfect for heavy use office or home situations. The envelope is a #10, perfect for the 8-1/2”x11” letter. It has a peel-off backing so no more licking the envelope! Remember George Costanza and his fiancé that succumbed to the glue on the envelope? He’d still be engaged had they ordered these envelopes! [Is that a good thing?]A subtle thing I noticed about these envelopes is that they are light weight, more so than similar products. The great thing about that is with rising postage, weight matters. Using these envelopes could make the difference in saving you tens or hundreds of dollars over the long hall, saving on postage by weight.I’m a prolific letter writer and each letter could go to 10 or 20 recipients, so I go through envelopes fast. This will definitely be a reorder item, and you can’t beat the price.
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donnaelmaryod9947@gmail.com
08-03-2026First and foremost, I do not get paid to write reviews. I also did not receive this product for free in exchange for a good review.I got these yesterday and I’m definitely pleased with the quality. These seem to be as good as major name brand envelopes for significantly cheaper.These are security envelopes, meaning people will have a hard time reading through them. The self sealing adhesive is very good as well. It’s much better than the name brand that I bought at the local store, where the adhesive isn’t strong enough to keep the envelope closed.I don’t mail all that often, so I figure 500 envelopes will be plenty for a year. I’m hoping the adhesive lasts as long. I will update in the months to comes.
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sunwenerji@gmail.com
08-03-2026I send out hundreds of flyers a week! These are a deal! easy to stuff, the security pattern inside prevents you from seeing anything inside, and the adhesive seals EVERY TIME increasing my productivity!
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emiralyballleeann@gmail.com
08-03-2026These envelopes was perfect for my project. I also loved that they were self sealing .
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ofolgapatriciaiq1746@gmail.com
08-03-2026Good quality, good price
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ioconner@hotmail.com
08-03-2026Good quality, came in a nice box and is easy to peel off.Will buy it again
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erunovazex34@gmail.com
08-03-2026The price of this product is great. The quality is excellent, a terrific product at a great price.
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bea******
Trop chère
842******
La calidad es excelente.El gran detalle es que el paquete venía incompleto, de los 500 mencionados, faltaron alrededor de 10 sobres.
qmc******
These #10 envelopes are a good item and nice not to lick tab to seal. I use them for bulk mailing and they are good quality. I will buy more as needed.
ocg******
This envelope is perfect for heavy use office or home situations. The envelope is a #10, perfect for the 8-1/2”x11” letter. It has a peel-off backing so no more licking the envelope! Remember George Costanza and his fiancé that succumbed to the glue on the envelope? He’d still be engaged had they ordered these envelopes! [Is that a good thing?]A subtle thing I noticed about these envelopes is that they are light weight, more so than similar products. The great thing about that is with rising postage, weight matters. Using these envelopes could make the difference in saving you tens or hundreds of dollars over the long hall, saving on postage by weight.I’m a prolific letter writer and each letter could go to 10 or 20 recipients, so I go through envelopes fast. This will definitely be a reorder item, and you can’t beat the price.
don******
First and foremost, I do not get paid to write reviews. I also did not receive this product for free in exchange for a good review.I got these yesterday and I’m definitely pleased with the quality. These seem to be as good as major name brand envelopes for significantly cheaper.These are security envelopes, meaning people will have a hard time reading through them. The self sealing adhesive is very good as well. It’s much better than the name brand that I bought at the local store, where the adhesive isn’t strong enough to keep the envelope closed.I don’t mail all that often, so I figure 500 envelopes will be plenty for a year. I’m hoping the adhesive lasts as long. I will update in the months to comes.
sun******
I send out hundreds of flyers a week! These are a deal! easy to stuff, the security pattern inside prevents you from seeing anything inside, and the adhesive seals EVERY TIME increasing my productivity!
emi******
These envelopes was perfect for my project. I also loved that they were self sealing .
ofo******
Good quality, good price
ioc******
Good quality, came in a nice box and is easy to peel off.Will buy it again
eru******
The price of this product is great. The quality is excellent, a terrific product at a great price.
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Next page#10 Business Envelopes with Security Tint and Secure Seal
Blue Summit Supplies Secure Seal Types
Compare Blue Summit Supplies #10 Business Envelopes
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.
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.
Moisten the strip of adhesive found on the envelope's flap and fold over to seal contents securely inside.
No moisture is required, just flip up the bottom flap, fold over the top flap and press to secure contents safely inside.
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