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#10 Double Window Security Envelopes, Flip and Seal, 500 Count

3 Reviews

  • 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 
  • Flip and seal flap is quick and easy to use without any need 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 latex glue seal throughout transit. Eliminate the hassle of having to moisten gummed seals or removing the protective strips used in peel and seal envelopes; with flip and seal envelopes, there’s no licking, peeling, or taping required. Simply flip up the folded edge, then flip down the flap to seal!

    Made from a durable 24lb white wove paper and equipped with a low profile flap design, this envelope is extra 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.


    #10 Double Window Security Envelopes, Flip and Seal, 500 Count

    Part #: BSS-92588-008

    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: 500 Count


    • This envelope is equipped with a flip and seal closure. It does not require moistening.
    • This envelope is not suitable for printing in a laser printer, as the heat will melt or warp the windows.
    • While this envelope will work with QuickBooks invoices, it is NOT suitable for sending QuickBooks checks, as check information will not line up properly in the windows. Please click here for envelopes suited for mailing QuickBooks checks.
    • 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-92588-008
      • SKU: JE-Z02Z-X6NA
      • Barcode: X001BYBRB1
      • Package dimensions: 12 x 10.1 x 4.4 inches
      • Package weight: 6.05 pounds

      Customer Reviews

      4.7 Based on 3 Reviews
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      Filter Reviews:
        Lucy S.
        United States

        So glad we found you!

        Quality, price and promptness

        Angel D.
        United States United States

        #10 Envelopes

        I like the design. I was thrown off by them, at first, but I think it's quite fun.

        Nancy B.
        United States

        Superior Quality and Lighning Fast Shipment

        We love the idea of having a perforation on our envelopes! Very easy to open and great quality. They arrived the day after we ordered!