500 No. 9 Flip and Seal Double Window Security Envelopes - Designed for Quickbooks Invoices and Business Statements with Self Seal Flip Press and Seal Flap -Number 9 Size 3 7/8 Inch X 8 7/8 Inch
Inhouse product
- Perfectly fits QuickBooks Invoices and business statements: sender and return address will be visible on your QuickBooks invoices and monthly bills through our unique double window design.
- Quickly and easily stuff our wide envelopes with several invoices or business statements
- Provides complete business mail security: your invoices and statements will be completely hidden with our dark security tint design
- Save time with easy to use flip and seal self-seal design; With no need for licking or moistening, our self seal design allows for sending hundreds of invoices quickly and easily and is guaranteed to stay sealed with no need for tape or glue sticks.
- 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 |
| Material | Paper, Plastic |
| Number of Items | 500 |
-
avery@microsoft.com
08-03-2026I have been using these envelopes for a couple of years. So far I have not had one issue. They are good quality and easy to use. I’ve not had any problems with them sealing properly. I’ll continue to use this brand, it’s the best value I have found!
-
aurenceperez@gmail.com
08-03-2026Great envelopes
-
arowe@doyle.com
08-03-2026I bought these for work for mailing checks printed from Quickbooks. They work perfectly and are less than half the cost of the envelopes from Intuit. If your company uses Quickbooks and you mail checks, these are a no brainer, save money without sacrificing quality
-
asignakahana854@gmail.com
08-03-2026I really appreciate not having to lick the envelopes. I love that they are self adhering. Will be ordering more
-
sosvdisdsxald999@gmail.com
08-03-2026# 9 Self Seal envelopes are usually great, but this batch seems to be losing it's stick after a couple of years. Purchased 11/2023, and now am having to put a piece of tape, just to make sure that the envelope doesn't open.Some of them may keep closed, but I just can't trust them. Other than that, they are great, and do the job for Quickbooks desktop invoices. I have purchased more than once, but they seem to have a shelf life....I can deal with adding tape, at least for now. Maybe will choose the peel off option the next time...
-
kayjosephine@yourdomain.com
08-03-2026Great price.. same envelopes staples sells for $99 for 500. No brainer
-
graysonturner@microsoft.com
08-03-2026Good value for everyday office use.
-
joel@microsoft.com
08-03-2026This is a quality item and a great value.
-
lionaannavellen315@gmail.com
08-03-2026Good envelopes. Size little different, but I can use.
-
测试2
08-03-2026it is cheaper than staple, the quality is good
-
jqja8172720@gmail.com
08-03-2026Bought my first box in May 2022, 500 envelopes. I know some lift and seal envelopes can lose adhesion over time, but I just finished my first box (April 2025) and the last envelope sealed just fine.Hope my second box performs just as well.
-
oma.ryan@hotmail.com
08-03-2026I purchased these envelopes and the fit is perfect for our invoices. Easy to seal and a great price! Will definitely buy again!
-
nancydjlauraog1970@gmail.com
08-03-2026I bought these as an experiment to see if i could cut spending on quickbooks brand envelopes. While the value was amazing, these aren't suited for that. The windows don't quite match up with quickbooks checks and the folds are difficult to get the checks inside.
-
ave******
I have been using these envelopes for a couple of years. So far I have not had one issue. They are good quality and easy to use. I’ve not had any problems with them sealing properly. I’ll continue to use this brand, it’s the best value I have found!
aur******
Great envelopes
aro******
I bought these for work for mailing checks printed from Quickbooks. They work perfectly and are less than half the cost of the envelopes from Intuit. If your company uses Quickbooks and you mail checks, these are a no brainer, save money without sacrificing quality
asi******
I really appreciate not having to lick the envelopes. I love that they are self adhering. Will be ordering more
sos******
# 9 Self Seal envelopes are usually great, but this batch seems to be losing it's stick after a couple of years. Purchased 11/2023, and now am having to put a piece of tape, just to make sure that the envelope doesn't open.Some of them may keep closed, but I just can't trust them. Other than that, they are great, and do the job for Quickbooks desktop invoices. I have purchased more than once, but they seem to have a shelf life....I can deal with adding tape, at least for now. Maybe will choose the peel off option the next time...
kay******
Great price.. same envelopes staples sells for $99 for 500. No brainer
gra******
Good value for everyday office use.
joe******
This is a quality item and a great value.
lio******
Good envelopes. Size little different, but I can use.
测******
it is cheaper than staple, the quality is good
jqj******
Bought my first box in May 2022, 500 envelopes. I know some lift and seal envelopes can lose adhesion over time, but I just finished my first box (April 2025) and the last envelope sealed just fine.Hope my second box performs just as well.
oma******
I purchased these envelopes and the fit is perfect for our invoices. Easy to seal and a great price! Will definitely buy again!
nan******
I bought these as an experiment to see if i could cut spending on quickbooks brand envelopes. While the value was amazing, these aren't suited for that. The windows don't quite match up with quickbooks checks and the folds are difficult to get the checks inside.
Previous page
Folders
Envelopes
School Supplies
Tape
Next page#9 Business Envelopes with Security Tint and Secure Seal
Blue Summit Supplies Secure Seal Types
Compare Blue Summit Supplies #9 Business Envelopes
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.
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.
Related products
