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#10 Windowless Security Envelopes, Self Seal, 100 Count

1 review

  • Durable and professional go-to standard business envelope for mailing invoices, statements, and other office mailing needs
  • Roomy enough for a return envelope to be included, so you can get paid faster
  • Low profile flap design creates a wide opening for easy and quick envelope stuffing 
  • Peel and seal flap makes it simple to close without having to lick or moisten the glue
  • Dark security tint lining keeps your important documents securely concealed throughout transit


It’s no secret that the #10 security envelope is the workhorse of business mailings, and we’ve designed our standard gummed seal #10 envelope to keep your documents safe and secure behind a strong permanent glue seal throughout transit.

Our most popular business envelope is made from a durable 24lb white wove paper and comes equipped with a low profile flap design, which makes it easy to fold and stuff up to 10 sheets of standard letter size paper inside with room for a #8 or #9 return envelope as well – so you can make it simpler than ever for your clients to quickly return payments to you. And with our dark security tint lining the inside, your confidential mail will stay concealed and secure all the way to its destination. It’s an envelope choice that’s simple enough for everyday letters and statements, yet professional and secure enough for even high-profile business communications.

Part #: BSS-92588-015

We stand behind our products completely. We understand that buying products online can sometimes be difficult because you cannot physically see what you are buying; however, if our product is not exactly what you are looking for or does not meet your expectations, then we welcome you to send them back anytime for a 100% refund. Click here for more information regarding refunds or returns >

Key Features:

  • #10 double window envelope
  • Dimensions: 9 1/2 inches X 4 1/8 inches
  • Security lining
  • 24lb white wove paper
  • Package quantity: 100 Count


  • This envelope is equipped with a self seal, which means it requires that you peel away the protective strip to reveal the glue. It does not require moistening, but cannot be used in a bulk mail machine (only standard gummed seal envelopes can be used in mail machines).
  • This envelope is not suitable for printing in a laser printer, as the heat will melt or warp the windows.
  • Do you go through envelopes quickly? This product is also available in a cost-effective bulk 500 count package.
  • Not sure what type of number 10 envelope is right for you? Read our blog post about #10 envelopes, wherein we help you wrap your head around every detail you never knew you needed.

Product Details:

  • Brand: Blue Summit Supplies
  • Part #: BSS-92588-015
  • SKU: G1-QU1R-NO1S
  • Barcode: X001DZRGIL
  • Package dimensions: 9.8 x 4.2 x 3.1 inches
  • Package weight: 1.32 pounds
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    Fast, Secure, Expectations Exceeded!

    Blue Summit has won my business for a life time! There customer service team was rock solid when directing me to the perfect envelope for my business. We send thousands of invoices and quotes a year and those envelopes are self-sealing to make the process that much faster. In the busy age we live in it’s sometimes tough to manage employees and make sure the office supplies are stocked. The one-click auto-ship option allowed me to put office supplies on auto pilot so I can continue to grow my business! Thank you Blue Summit Team!!