Amazon Basics #9 Security Tinted Double Window Envelopes for Invoices and Documents, Self-Seal, 3-7/8" x 8-7/8", White, 500-Pack

These are great number nine envelope envelopes they fit our checks perfectly and they’re easy if you’re sending out a lot of mail and you cannot beat the price anywhere highly recommend recommended

If you can buy in bulk, these are half the price of Staples.

I use these envelopes daily in my office. They work well for all my quickbooks invoices as well as mailing checks and payroll. They look professional and seal well.

Easy to use business window envelope. A quick pull of the protective tape makes sealing a breeze when doing a large mailing.

Have been using these envelopes to send checks. They seal great and the check fits perfectly. We used to get envelopes at the local office supply, but they were not always in stock. Started ordering these and won't be making a change any time soon. One thing to keep in mind with envelopes, is to make sure the size of the envelope and windows match the document to be mailed. Along with the placement of the windows.

Ok

We always order these envelopes for our business. They're perfect and arrive quickly.

These envelopes work perfectly for QuickBooks checks.

Good deal and good quality

Best bang for your buck! This is the 2nd box I purchased for our office.

As expected.

Seal is good, small but still fits letters just have to adjust to fit the windows. Price however went from $25+ to $43+ so that’s unfortunate as I have to reconsider at that price to continue with them anymore

But I had to return them because they are so small. they barely even fit a letter. Terrible.