Customer Reviews for Staples Self Seal Self Seal Security Tinted #9 Double Window Envelopes, 3 7/8" x 8 7/8", White, 500/Box (ST28731-CC)
Item # : 1775861
Model # : ST28731-CC
Send mail easily with this 500-pack of Staples security-tinted double-window self-sealing #9 envelopes.
- Pressure Sensitive Adhesive
- #9 business envelopes are suitable for all your mailing needs
Price is $35.79
Unit of measure 500/Box Price per unit $0.07/Envelope
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Over 30
248 reviews
Most helpful positive review
Posted Apr 24, 2020
Great for QB invoices
I wish it had been easier to find the right one for QuickBooks invoices, but most reviews don't mention that. I have purchased these envelopes in other sizes but they were check envelopes. These are the ones that are the correct size for QuickBooks invoices. Thank goodness I found them.
VS
Most helpful critical review
Posted Jan 2, 2020
Will not order again
The checks do not line up in the windows correctly (i.e - the Pay to the Order of line appears in the top window, the address appears in the lower window as does the Memo line.
Staples Customer
Verified Buyer
Posted Jul 25, 2025
Glued corners?
We couldn’t get folded letters into the bottom corners of these envelopes. We have to stick a pen into the corner to open it up before the paper slides where it is supposed to go
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ROSA B.
Verified Buyer
Posted Jul 24, 2025
CRITIC OF WILL NOT ORDER THESE AGAIN JAN 2020
These are size #9 envelopes and are 8.875 " wide. They are for invoices, and they fit invoices very well as long as you line up the template correctly. These ARE NOT FOR standard CHECKS. Checks will not line up correctly. If you need an envelope for checks, order a size # 8 that is 8 5/8" inches wide and is made for standard check mailing. Do not complain if you order t...
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Michelle W.
Verified Buyer
Posted Jul 7, 2025
Does not seal
0up votes 0
0down votes 0
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Anthony L R.
Verified Buyer
Reviewed at:
Staples Advantage
Posted Jun 25, 2025
Horrible don't buy these
Spent a lot of money on these envelopes, they don't close properly, ripped up, and stuck to each other. Do Not Buy
0up votes 0
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Staples Customer
Verified Buyer
Posted Jun 7, 2025
Too big window
Window was way too big to keep check amounts hidden. If you have checks, these windows don’t hide anything
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A. C.
Verified Buyer
Posted Jun 6, 2025
Works for mailing payroll stubs and the self-sealing makes it more efficient. Price is very reasonable for a self-sealing option.
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Stephanie J.
Reviewed at:
Staples Advantage
Posted May 30, 2025
Disappointing Quality
Our company has reordered these envelopes many times, with no issues in the past. I noticed that the last 2 boxes were manufactured in the UAE while the one previous to that were from Germany. The quality difference is noticeable. The new one half the envelopes have glue where it shouldn't be, leading to having to rip it open to use. I have had to throw many away due to...
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Whitney
Verified Buyer
Posted May 21, 2025
Changed product
We have used these for years. Our most recent box I noticed the envelopes were different. These are TERRIBLE! They are crooked and cut horribly and the glue strip hardly sticks and doesn't line up at all. I don't think you can even call these self sealing! You can try but they don't stay shut. PLEASE BRING BACK THE OLD ONES.
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Response from Staples :
Hi, I regret to hear this happened, and I understand your frustration. Please contact our Product Brands Group at (800) 425-0049 or via email at [email protected] for further assistance. The hours of operation are Monday to Friday, 9AM to 8PM EST. ^MS
Staples C., May 22, 2025
DANIS H.
Verified Buyer
Reviewed at:
Quill
Posted May 20, 2025
Didn't Fit
Unfortunately this envelope didn't fit the format of our checks.
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QOLHS
Verified Buyer
Reviewed at:
Staples Advantage
Posted May 15, 2025
Disappointed
unable to use half the box cut very cricket it was horrible.
thanks
thanks
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Greg
Posted May 15, 2025
Used to be Good, Now Pretty Terrible
I've ordered these envelopes twice, once in 2023 and again in 2024. The box from 2023 would get 5 stars: envelopes were easy to use, sealed properly, in short, they did their job. I re-ordered in late 2024 as my stock was running low and the new box would get 1 star: at least one of every seven envelopes needs to be tossed due to some issue, whether its the glue not sti...
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1up votes 1
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Staples Customer
Verified Buyer
Posted May 12, 2025
Horrible Envelopes!
I have purchased these envelopes for years to do monthly invoicing for a utility company and have alwasy loved them. For some reason Staples changed them and now the self adhesive does not line up to close the envelope so I have had to use a glue stick to close the them. Do Not Buy These!
1up votes 1
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Response from Staples :
Hi, Thanks for reaching out to us about this. I'm sorry to hear you're dissatisfied with the envelopes. I've received your feedback and have forwarded your comments as a suggestion for future improvement. ^MS
Staples C., May 15, 2025
Staples Customer
Verified Buyer
Posted May 2, 2025
Poor quality
These are not the same quality as in the past.
3up votes 3
0down votes 0
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Jennifer
Reviewed at:
Staples Advantage
Posted May 2, 2025
Terrible
Many of the envelopes didn't have glue on them. They don't seal very well at all. When I reordered self-sealing envelopes, I thought we were going to be getting the ones we had previously. Those were much better. These envelopes stink. I won't be ordering these again.
1up votes 1
0down votes 0
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Janae C.
Verified Buyer
Reviewed at:
Staples Advantage
Posted Apr 23, 2025
Do not seal
These are not the best and hardly seal.
1up votes 1
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Staples Customer
Verified Buyer
Posted Apr 17, 2025
Glue all over
Over half of the envelope have glue from the window onto the back of the envelope, so they are not easily openable, the fact we did not figure out until after we had put stamps on them
1up votes 1
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Gregory I.
Verified Buyer
Reviewed at:
Staples Advantage
Posted Apr 16, 2025
These envelopes are total garbage, I DID NOT receive the same envelopes that I had gotten in the past, as I got into the box more than half of them did not seal and needed to be taped also many of the envelopes were glues shut in the corners so that I could not put a check in them
1up votes 1
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Staples Customer
Verified Buyer
Posted Apr 9, 2025
POOR SEALING MECHANISM
These envelopes seal well after the flap can be raised, but the flap is often stuck or crumpled. It is very frustrating on how much time it takes to prepare these envelopes for mailing due to this flap problem. I would not buy these again.
2up votes 2
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VALERIE R.
Verified Buyer
Posted Mar 30, 2025
No seal self seal
Doesn’t really seal great I won’t buy again.
0up votes 0
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Staples Customer
Reviewed at:
Quill
Posted Mar 18, 2025
Price up but Item quality down
The quality of this envelope has declined in recent months. I just used the last of the ones I purchased in 2024 and ordered 2 more boxes. I will be returning one of them as I found most of them with very little sealant and most of them crumpled up. It was hard to put mail in the envelopes as well. Really slowed our process down so I was only able to use some of the one...
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3up votes 3
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