Save Time and Money with The GSM Office #9 Self Seal Double Window Envelopes

It can be a pain to send printed Quickbook invoices through the mail with normal envelopes. You must either use a standard envelop...

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Product Review

Save Time and Money with The GSM Office #9 Self Seal Double Window Envelopes

It can be a pain to send printed Quickbook invoices through the mail with normal envelopes. You must either use a standard envelope and spend time addressing the envelope, or struggle with getting the correct invoice details to line up to show through the envelope windows. Our envelopes are specifically designed to fit most quickbooks standard printed invoice layouts, allowing the sender and receiver addresses to be seen while hiding the contents of the invoice.

High Quality Construction

Our self seal double window envelopes are made to high quality standards with the following specifications:

#9 Envelopes with 3 7/8 inch width and 8 7/8 inch length.

Double window design to accomodate most printed invoice layouts (see the product pictures for exact design specifications).

Made with 26 lb white paper and a blue woven security pattern.

Uses a strong adhesive peal and self seal that does not require moisture to seal.

Comes in a convenient box of 500.

Money Back Guarantee

These self seal double window envelopes come with our money back guarantee. If the envelopes fail to live up to your expectations, simply return them for a full refund.



  • DESIGNED FOR QUICKBOOKS PRINTED BUSINESS INVOICES - Save time and energy with our self seal double window envelopes specifically designed for use with most printed Quickbooks business invoice layouts. The double widows are built to display the sender and receiver addresses of standard invoice configurations.
  • EASY ADHESIVE SELF SEAL - Our peel and seal envelopes do not require moisture to activate the adhesive. Simply insert the invoice, peal away the protective strip, and press the envelope flap down firmly for a strong adhesive hold.
  • SECURITY PATTERN PROTECTS YOUR INFORMATION - The woven blue security pattern prevents the contents from being seen through the 26 lb white paper envelope. This will give you peace of mind to know that your invoices are only viewed by the intended recipient.
  • BOX OF 500 DRIVES VALUE - Our #9 envelopes come in a box of 500, and are perfect for bulk mailings or general office supply. Save money, time, and energy by stocking up with the 500 count box.
  • Self Seal Double Window Security Envelopes #9

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