Customer Reviews for Staples InstantSeal Security Tinted #10 Double Window Envelopes, 4 1/8" x 9 1/2", White, 500/Box (ST63339)
Item # : 1775862
Model # : ST63339
Mail all your business correspondence with this 500-count box of Staples InstantSeal security-tinted double-window envelopes.
- New and improved envelope
- Tamper proof, perforated seal to keep documents safe
Price is $39.99
Unit of measure 500/Box Price per unit $0.08/Envelope
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Over 30
15 reviews
Most helpful positive review
Posted Nov 4, 2025
Secure easy close feature
These Staples #10 envelopes make mailing so much easier. The instant-seal feature is a total game changer, no licking, no soggy seals, and no glue sticking to your fingers. Just press and you’re done! They seal tightly every time and look clean and professional. The size is perfect for everyday mail and business use, and the paper feels sturdy and high-quality. If you’r...
Read full review
VS
Most helpful critical review
Posted Oct 31, 2025
Sticky strip difficult
The envelopes are slightly larger than I was hoping. They are wider than a piece of paper so a standard paper slides inside. The same for the quickbooks checks we use. The sticky part is not great. We use other brands and this one has a perforated strip to rip off that doesn’t rip perfectly so some pieces of paper are left behind and get in the way of the sticky strip. ...
Read full review
SuperSweet03
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Nov 4, 2025
Secure easy close feature
These Staples #10 envelopes make mailing so much easier. The instant-seal feature is a total game changer, no licking, no soggy seals, and no glue sticking to your fingers. Just press and you’re done! They seal tightly every time and look clean and professional. The size is perfect for everyday mail and business use, and the paper feels sturdy and high-quality. If you’r...
Read full review
0up votes 0
0down votes 0
Report
mweisert
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Nov 2, 2025
Window envelopes
These envelops are durable and good for business mailings. They are not flimsy or see through - they have the nice blue detailing inside to prevent others for checking the contents. The size is good for all standard letters and documents. The instant seal option is new to me and is a lot nicer than having to lick or moisten the adhesive. I have used the peel and stick e...
Read full review
0up votes 0
0down votes 0
Report
SJML52
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Nov 2, 2025
Great non lick envelopes
My overall impression of these envelopes was they are sturdy, quality paper--not flimsy like some, a clear window and self adhesive!! No licking required! They hold shape well and don't seem like the kind of envelope that would be smashed by careless mail carriers! The quality seems above average and they are perfect letter size papers. I trifold any normal size paper b...
Read full review
0up votes 0
0down votes 0
Report
TeMaEv
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Nov 1, 2025
Great convenience
I received a sample of this product for my honest review feedback.
Our family found these envelopes to meet all of our needs. They were a good quality and the window plastic was secured well so it didn’t come off. We thought that the adhesive was adequate, easy to seal. The envelopes themselves seemed to he secure, with nothing showing through the paper. Overall, ...
Our family found these envelopes to meet all of our needs. They were a good quality and the window plastic was secured well so it didn’t come off. We thought that the adhesive was adequate, easy to seal. The envelopes themselves seemed to he secure, with nothing showing through the paper. Overall, ...
Read full review
0up votes 0
0down votes 0
Report
Jays91
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Nov 1, 2025
Professional easy and convenient
Our office has been using these envelopes for general mailings and they have been so convenient and easy to use. Drafting letters and formatting to fit the windows was very easy and we had no issues making them look professional. The seal sealer was a little tricky since it is perforated. I would rather it be a strip to reveal the adhesive. The perforated strip can...
Read full review
0up votes 0
0down votes 0
Report
Sticky
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Oct 31, 2025
Sticky strip difficult
The envelopes are slightly larger than I was hoping. They are wider than a piece of paper so a standard paper slides inside. The same for the quickbooks checks we use. The sticky part is not great. We use other brands and this one has a perforated strip to rip off that doesn’t rip perfectly so some pieces of paper are left behind and get in the way of the sticky strip. ...
Read full review
0up votes 0
0down votes 0
Report
Jessicanjzee
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Oct 31, 2025
Good quality
These envelopes are made well and are good quality. I like the windows for return address and mailing address. The size of the envelopes are good for standard paper. They are very easy to seal and I like that the Instantseal makes it so I do not have to lick the envelope. The seal remains secure keeping my mail safe.
0up votes 0
0down votes 0
Report
dar3x
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Oct 31, 2025
Fine envelopes
My overall impression is that these are good quality business envelopes. They're obviously standard size, have gently tinted double windows for privacy and are well constructed. The paper isn't flimsy and neither were the plastic windows (I haven't used an entire box yet, but of the ones I've been through not a single window has come loose or unglued!). I exclusivel...
Read full review
0up votes 0
0down votes 0
Report
KVetter
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Oct 20, 2025
Great Envelopes for the Office
We tested these out in our public school district office, and we were very happy with them. We handle extremely delicate information, so anything we send out needs to be very secure. I felt like these envelopes are just that! They weren’t in the least transparent, so we didn’t worry at all about that. The seal was very different from a regular self-sealing envelope, and...
Read full review
0up votes 0
0down votes 0
Report
Amckinney1219
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Oct 19, 2025
Window Envelopes
The envelopes were great. Perfect t size to mail letters. Has a nice viewing window for the sender’s address. The envelop is made from good quality paper, which means it won’t fall apart during shipping. It was easy to seal and the seal was nice and tight. I feel confident using these envelopes.
0up votes 0
0down votes 0
Report
MomNurse
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Oct 19, 2025
So easy to us
The Staples #10 White Envelopes are a simple product done right. The paper quality feels sturdy, not too thin or flimsy, making them ideal for mailing letters, invoices, or professional correspondence. The adhesive seal is strong and secure yet easy to close without making a mess or requiring moisture. They have a clean, bright white finish that looks crisp and professi...
Read full review
0up votes 0
0down votes 0
Report
Momof3
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Oct 18, 2025
Just what my home office needed
These envelopes from Staples are great quality. The address to and return windows were a perfect fit for the statements I mailed out. I do not like envelopes that need to be moistened to seal. These self sealing envelopes are great and easy to use. They make sending multiple pieces of mail quick, which is important when pressed for time.
0up votes 0
0down votes 0
Report
K.B.
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Oct 16, 2025
Does the job
These envelopes are exactly what I was looking for - appropriate windows to mail the checks from my organization. Seal works well no complaints. Very adequate for the job.
0up votes 0
0down votes 0
Report
S.T.
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Oct 15, 2025
Excellent self adhesive envelopes
I thought the quality of the envelopes was excellent! The size is perfect for standard letter filings and it can fit several pages at a time. They were super easy to seal and the adhesive was excellent and secure. The adhesive was my favorite part of the envelope. I would highly recommend.
0up votes 0
0down votes 0
Report
J.B.
This reviewer received a free product or coupon in exchange for an unbiased review of the product
Posted Oct 14, 2025
Instant seal legal envelopes
These envelopes are of good quality; they are of a good weight (not too flimsy or thin) and are true privacy envelopes—I could not see my documents through the envelope. I like that I do not have to lick them but I do prefer the top sealing strips rather than bottom—these tear of the edge of the envelope; HOWEVER- they seal must better than than top seal ones. Overal...
Read full review
0up votes 0
0down votes 0
Report