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 $24.99, Regular price was $27.69, You save 9%
Unit of measure 500/Box Price per unit $0.05/Envelope
30-min pickup
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Over 30
1991 reviews
Most helpful positive review
Posted Jan 14, 2026
Best in Class
These envelopes are the best Jerry, the best!
VS
Most helpful critical review
Posted Jan 24, 2026
Stay Away
Junk- Came all damaged- scratched-- NOW before anyone say the shipper, the box was perfect, I mean perfect. The inside cabinet was compressed where ropes were tied around it- Then calling customer service in an abroad call center was a disaster- English was not spoken or heard by the person on the other end of the phone- Sad Staples has fallen victim to cheap call...
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MR I Cant Believe it
Verified Buyer
Posted Jan 24, 2026
Stay Away
Junk- Came all damaged- scratched-- NOW before anyone say the shipper, the box was perfect, I mean perfect. The inside cabinet was compressed where ropes were tied around it- Then calling customer service in an abroad call center was a disaster- English was not spoken or heard by the person on the other end of the phone- Sad Staples has fallen victim to cheap call...
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Tasha
Verified Buyer
Reviewed at:
Staples Business
Posted Jan 15, 2026
Envelope Rating
envelopes open up on the side
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mk
Verified Buyer
Posted Jan 14, 2026
Best in Class
These envelopes are the best Jerry, the best!
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Posted Jan 5, 2026
I have used these for years. Recently they significantly decreased the size of the self stick strip. The envelopes do not feel properly secured at all. Will go elsewhere in the future. It's a shame, staples used to be my go to.
1up votes 1
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Dale K
Verified Buyer
Posted Jan 5, 2026
Envelope Review
The envelopes have worked well - No reported flaws in the adhesive or the quality of the envelope itself.
We have mailed out over 3000 items to date.
We have mailed out over 3000 items to date.
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n/a
Verified Buyer
Posted Dec 28, 2025
self seal #10 envelopes
I like them because they are convenient for my need
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michrod
Posted Dec 28, 2025
do NOT seal
these envelopes do NOT self seal. I had to use a glue stick. what a waste.
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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.
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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.
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Gun
Verified Buyer
Posted Dec 14, 2025
Envelope
Was able to get without having to order
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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...
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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.
1up votes 1
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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!
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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.
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L.R.
Posted Sep 28, 2025
Good envelopes
They worked well when sealed.
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JAMES L.
Verified Buyer
Reviewed at:
Staples Business
Posted Sep 12, 2025
Fast and easy
Makes ordering office supplies from home easy.
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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.
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CECILIA N.
Posted Aug 10, 2025
Good envelopes!
We like these; we would order them again and we would recommend them.
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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!!!
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BRENDA H.
Posted Jul 28, 2025
Staples No 10 Security Envelopes
Great product especially for the price
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