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500 No. 9 Self Seal Security Envelopes – Peel and Seal Designed for Secure Mailing - Security Tinted with Printer Friendly Design - Number 9 Size 3 7/8 Inch X 8 7/8 - Pack of 500
500 No. 9 Self Seal Security Envelopes – Peel and Seal Designed for Secure Mailing - Security Tinted with Printer Friendly Design - Number 9 Size 3 7/8 Inch X 8 7/8 - Pack of 500
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#9 Windowless Security Envelopes Create Completely Secure Mail

We understand how difficult it can be to find security or privacy envelopes that completely secure and hide your envelope contents thr...

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#9 Windowless Security Envelopes Create Completely Secure Mail

We understand how difficult it can be to find security or privacy envelopes that completely secure and hide your envelope contents throughout the mailing process. Our envelope design protects your mail contents throughout transit all the way to its destination.

  • Windowless design is the safest type of envelope, with no chance of confidential information showing through windows. Easily print, write, or add labels to address the envelope.
  • Quick and easy to use our self sealing design, featuring a strong adhesive that completely secures your contents to prevent them from falling out and being lost or shown to others.
  • Dark black security tint lining is completely opaque and blocks others from seeing your documents
  • Thick and durable 24 lb white paper stock that completely protects your contents during transit, with no need to worry about it tearing during transit

Save time sending your mail by printing directly onto the front

Our low profile design makes for easily printing in most HP, Epson, Brother, Cannon, Xerox, and other standard laser and ink jet printers.

100% Money Back Guarantee

We stand behind our products completely. We understand that sometimes buying physical products can be difficult if 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 send it back anytime for a 100% refund.



  • Perfect for secure everyday home and business mailing. Our security #9 windowless envelopes perfectly fit standard 8.5’’ x 11’’ paper sizes and other large documents. Easily fits invoices, letters, checks, and more.
  • Provides complete mail security. No need to worry about others seeing your documents, our dark black security tint completely hides your mail.
  • Just peel and seal to create a strong lasting seal without licking or moistening. Our self seal design is quick and easy and is guaranteed to stay sealed with no need for tape or glue sticks.
  • Easily print hundreds of envelopes with our low profile envelope design. Our printer friendly envelopes with smooth thick paper saves you time and frustration while printing without having to worry about jamming. These envelopes are designed for both laser and inkjet printers.
  • Maintains professional look and feel throughout transit with our durable 24 lb white wove envelope paper

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