Customer Reviews for Staples QuickStrip EasyClose Self Seal Security Tinted #10 Business Envelopes, 4 1/8" x 9 1/2", White, 500/Box (ST50312-CC)
Item # : 787385
Model # : ST50312-CC
Keep mailings confidential with these Staples EasyClose security-tint #10 white envelopes, which feature a unique interior pattern to help prevent information theft.
- US #10 business envelopes are suitable for many mailing projects
- Made from white 24 lb. paper for durability
Price is $27.69
Unit of measure 500/Box Price per unit $0.06/Envelope
30-min pickup
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
1974 reviews
Most helpful positive review
Posted Dec 23, 2025
Secured Mail
I bought the ENV #10 P&S SECURI. I use them all the time. They work well.
VS
Most helpful critical review
Posted Dec 9, 2025
Poor quality
Poor quality self sealing strip. It is so thin and positioned into the inside of the flap that it is not secure. Also the strip is hit or miss with skipped adhesive and whether it runs the full length of the envelope. My last box (lasts me a few years) had a relatively wide sealing strip, it just didn't extend to the end of the flap so I had to secure it with tape. I fi...
Read full review
Verified Buyer
Posted Dec 23, 2025
Secured Mail
I bought the ENV #10 P&S SECURI. I use them all the time. They work well.
0up votes 0
0down votes 0
Report
AZ-MG
Verified Buyer
Posted Dec 19, 2025
Staples Brand Self-Seal Security Envelopes
These envelopes work great! We run them through our printer in large quantities to print our return address for future bill payments, and they feed easily every time. They’re affordable and more than sufficient for our needs. Great value, we’ll definitely continue using them.
0up votes 0
0down votes 0
Report
Gun
Verified Buyer
Posted Dec 14, 2025
Envelope
Was able to get without having to order
0up votes 0
0down votes 0
Report
Office manager
Posted Dec 9, 2025
Poor quality
Poor quality self sealing strip. It is so thin and positioned into the inside of the flap that it is not secure. Also the strip is hit or miss with skipped adhesive and whether it runs the full length of the envelope. My last box (lasts me a few years) had a relatively wide sealing strip, it just didn't extend to the end of the flap so I had to secure it with tape. I fi...
Read full review
0up votes 0
0down votes 0
Report
HENRY
Posted Nov 3, 2025
NO MORE GLUE
Don't waste your money! These used to be the best envelopes. Now they've cut way back on glue and don't stay stuck. sitting here taping all my envelopes because they open on their own now.
0up votes 0
0down votes 0
Report
LATIFE D.
Verified Buyer
Reviewed at:
Staples Business
Posted Oct 31, 2025
so far worst purchase!
Sides of all envelopes were open had to use tape to secure. Terrible product!
0up votes 0
0down votes 0
Report
Jeff S.
Verified Buyer
Posted Oct 21, 2025
where is the glue
The last box of envelopes we received are terrible. The glue is missing from at least half of the envelopes. I have to tape the envelopes shut.
0up votes 0
0down votes 0
Report
L.R.
Posted Sep 28, 2025
Good envelopes
They worked well when sealed.
0up votes 0
0down votes 0
Report
JAMES L.
Verified Buyer
Reviewed at:
Staples Business
Posted Sep 12, 2025
Fast and easy
Makes ordering office supplies from home easy.
0up votes 0
0down votes 0
Report
B.W.
Posted Aug 18, 2025
Self seal #10 envelops
The envelopes work great for mailing items. I thought the quick strip needs to be wider.
0up votes 0
0down votes 0
Report
CECILIA N.
Posted Aug 10, 2025
Good envelopes!
We like these; we would order them again and we would recommend them.
0up votes 0
0down votes 0
Report
Office Manager
Posted Aug 5, 2025
Worst seal EVER! Do not waste your money.
These envelopes are a complete waste of money. The seal isn't even near the edge of the flap requiring me to put scotch tape on every one of the envelopes that I use. They are not worth the savings that's for sure!!!
0up votes 0
0down votes 0
Report
BRENDA H.
Posted Jul 28, 2025
Staples No 10 Security Envelopes
Great product especially for the price
0up votes 0
0down votes 0
Report
KATHRYN S.
Posted Jul 1, 2025
fine meets expectations
0up votes 0
0down votes 0
Report
CYNTHIA C.
Posted Jun 22, 2025
Cheap and thin
Not the best quality. They’re very thin and the self adhesive strip is thin as well. I’ve bought better quality ones before that were namebrand.I wouldn’t buy them again.
0up votes 0
0down votes 0
Report
MELISSA P.
Posted Jun 15, 2025
Excellent
These are excellent. They are exactly what you need to send without any concern. worth it
0up votes 0
0down votes 0
Report
JOHN J.
Posted Jun 15, 2025
Envelopes
Ok envelopes. Glue strip not consistent from 1 envelope to another. Had to use a glue stick to help seal some of them. Really upset to click on review item and they come up $10.00 cheaper than what I paid.
0up votes 0
0down votes 0
Report
EDDIE W.
Posted Jun 10, 2025
Stapled Quick Seal Envelopes
adhesive not durable
1up votes 1
0down votes 0
Report
Nicole O.
Verified Buyer
Reviewed at:
Staples Business
Posted May 20, 2025
Does not stick
Have to use glue because the self-seal does not stick.
0up votes 0
0down votes 0
Report
JOYCE GADDIS
Posted May 18, 2025
Self SEAL Envelope
Very thin paper construction. Easy seal strip missing on quite a few of the envelopes. So between paper quality and construction quality I would say mediocre at best.
1up votes 1
0down votes 0
Report