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Double windows; professional, easily read double front windows suitable for standard business and legal mailings, eliminating constantly printing and hand writing addresses, advertising campaigns and many more, Each envelope contains two front windows, a 1-3/16" X 3-1/2" top window positioned 3/8" from the left and 2" from the bottom and the bottom 1" X 4" window is 3/8" from the left and 1/2" from the bottom.
Long lasting supply; ideal for everyday business use and professional mass mailings, each box of these premium #9 Security Envelopes provide a super long lasting 500 envelope supply, for the best value on the market! Click the Orange Button to order now. Security tint; forget thin, numbers and other data within, easily read envelopes these premium #9 Security Envelopes are designed with security tinted wave patterns which easily obscure details, perfect for mailing business statements and invoices while protecting sensitive information.

Save time with easy to use flip and seal self-seal design; With no need for licking or moistening, our self seal design allows for sending hundreds of invoices quickly and easily and is guaranteed to stay sealed with no need for tape or glue sticks.

Premium security check tint envelopes: the interior of our #9 Security envelopes use a dark navy, offer the protection contents and sensitive information, heavy coverage security tint to provide guaranteed privacy for your legal or business mail, a security tint makes envelopes hard to see through that ensures upmost privacy.
500 pack self seal envelopes:herkka #9 security envelopes are designed with peel & seal closure—no moisture needed and a premium security tint to protect sensitive information and a super strong SELF-SEAL strip. Long lasting supply: large sized envelopes and 500 envelopes in every pack for a long lasting supply, perfect for everyday business correspondence and large mailing tasks! Click the Orange Button to order now. Perfectly fits QuickBooks Invoices and business billing statements.

Double window envelopes show sender and receiver addresses; top window is 1 3/16" x 3 1/2"; 3/8" from the left; 2" from the bottom; bottom window is 1" x 4"; 3/8" from the left; 1/2" from the bottom.



Quickly and easily stuff our wide envelopes with several invoices or business statements. Maintains professional look and feel throughout transit with our durable 24 LB white wove envelope paper.

Box of 500 columbian white double window #9 envelopes 3-7/8" x 8-7/8" with a SimplySafe tamper-evident seal and peel off Release & Seal closure; top window: 7/8" x 3 1/2"; bottom window: 1" x 4".

1. Amazon Basics
#ad
Amazon Basics #9 Envelopes with Peel & Seal, Double Window, Security Tinted, 500-Pack
#adAmazon Basics #ad - 500-count pack of #9 security envelopes with Peel & Seal closure—no moisture needed. Measures 3-7/8 by 8-7/8 inches each. Double window allows sender and recipient addresses to show through.More information #ad
24-pound white wove paper for quality and strength; ideal for home or office. Interior security tint keeps content private; securely send checks, invoices, or other confidential documents.Brand | Amazon Basics #ad |
Manufacturer | Amazon Basics #ad |
Height | 8.8 Inches |
Length | 1 Inches |
Weight | 5.96 Pounds |
Width | 3.88 Inches |
Part Number | amz43 |
Model | AMZ43 |
More information #ad
2. Aimoh
#ad
Size 3-7/8 x 8-7/8-24 LB, for Invoices, Security Tinted, 500#9 Double Window SELF Seal Security Envelopes, 500 Count 30139, Statements & Documents
#adAimoh #ad - Quick seal adhesive; aimoh's #9 envelopes use ultra secure, quick seal adhesive to create a full, super secure seal across each envelope’s width that won’t easily open or tear as with cheaper gummed seals, perfect for larger and thicker documents. 9 double window quick seal security envelopes; tired of cheap thin, with premium security tint, extra large, easily torn envelopes? Aimoh's#9 Security Envelopes are the perfect solution, easily read dual front windows and super secure quick seal adhesive.Double windows; professional, easily read double front windows suitable for standard business and legal mailings, eliminating constantly printing and hand writing addresses, advertising campaigns and many more, Each envelope contains two front windows, a 1-3/16" X 3-1/2" top window positioned 3/8" from the left and 2" from the bottom and the bottom 1" X 4" window is 3/8" from the left and 1/2" from the bottom.
More information #ad
Long lasting supply; ideal for everyday business use and professional mass mailings, each box of these premium #9 Security Envelopes provide a super long lasting 500 envelope supply, for the best value on the market! Click the Orange Button to order now. Security tint; forget thin, numbers and other data within, easily read envelopes these premium #9 Security Envelopes are designed with security tinted wave patterns which easily obscure details, perfect for mailing business statements and invoices while protecting sensitive information.
Brand | Aimoh #ad |
Manufacturer | Aimoh #ad |
Height | 4.1 Inches |
Length | 11.5 Inches |
Weight | 0.01 Pounds |
Width | 9.2 Inches |
Part Number | FBA_30139 |
Model | 30139 |
More information #ad
3. Blue Summit Supplies
#ad
Designed for Quickbooks Invoices and Business Statements with Self Seal Flip Press and Seal Flap -Number 9 Size 3 7/8 Inch X 8 7/8 Inch, 500 No. 9 Flip and Seal Double Window Security Envelopes
#adBlue Summit Supplies #ad - Perfectly fits quickbooks invoices and business statements: sender and return address will be visible on your QuickBooks invoices and monthly bills through our unique double window design.Save time with easy to use flip and seal self-seal design; With no need for licking or moistening, our self seal design allows for sending hundreds of invoices quickly and easily and is guaranteed to stay sealed with no need for tape or glue sticks.
More information #ad
Quickly and easily stuff our wide envelopes with several invoices or business statements. Maintains professional look and feel throughout transit with our durable 24 LB white wove envelope paper. Provides complete business mail security: your invoices and statements will be completely hidden with our dark security tint design.Brand | Blue Summit Supplies #ad |
Manufacturer | Blue Summit Supplies #ad |
Weight | 5.27 Pounds |
Part Number | BSS-92588-007 |
Model | BSS-92588-007 |
More information #ad
4. HERKKA
#ad
24 LB, 500 Count, Number 9 Size 3 7/8 Inch X 8 7/8 Inch, #9 Double Window Security Envelopes, HERKKA No.9 Double Window Bussiness Envelopes Designed for Quickbooks Invoices and Business Statements
#adHERKKA #ad - Double window design: only sender and return address will show on your QuickBooks invoices and monthly bills through our unique 2 window. Quick-seal closure: our #9 envelopes are designed with an ultra strong SELF-SEAL adhesive strip to create a full, super secure seal across each envelope's width that won't easily open or tear, ideal for mailing for any letter sized and larger documents without splitting.Premium security check tint envelopes: the interior of our #9 Security envelopes use a dark navy, offer the protection contents and sensitive information, heavy coverage security tint to provide guaranteed privacy for your legal or business mail, a security tint makes envelopes hard to see through that ensures upmost privacy.
More information #ad
No show of memo, Payee line or amount in windows. Perfect for home or office; securely send checks or other confidential documents. 500 pack self seal envelopes:herkka #9 security envelopes are designed with peel & seal closure—no moisture needed and a premium security tint to protect sensitive information and a super strong SELF-SEAL strip. Long lasting supply: large sized envelopes and 500 envelopes in every pack for a long lasting supply, perfect for everyday business correspondence and large mailing tasks! Click the Orange Button to order now. Perfectly fits QuickBooks Invoices and business billing statements.
Brand | HERKKA #ad |
Part Number | No9-2Win-Lixing |
More information #ad
5. Quality Park
#ad
Double Window, 3-7/8 x 8-7/8 Inches, 500/Box QUA24529, 24 lb White, Invoices/QuickBooks Statements, Self Seal, Quality Park #9 Security Envelopes
#adQuality Park #ad - Stock up on boxes of 500 machinable #9 envelopes for bulk mailings. Redi-seal self seal mailing envelopes require no moisture; the unique double flap design allows you to simply raise the lower flap and press to seal.Double window envelopes show sender and receiver addresses; top window is 1 3/16" x 3 1/2"; 3/8" from the left; 2" from the bottom; bottom window is 1" x 4"; 3/8" from the left; 1/2" from the bottom.
More information #ad
These boxes of 500 white #9 double window security envelopes 3 7/8 in x 8 7/8 in protect your customers' sensitive data; a reflex blue pattern obscures the details of what's inside. 9 mailing envelopes measure 3 7/8 in height x 8 7/8 in width and are made of 24 lb white wove paper with professional side seams; #9 envelopes fit into #10 envelopes.Brand | Quality Park #ad |
Manufacturer | Quality Park #ad |
Height | 3.63 Inches |
Length | 13.13 Inches |
Weight | 5.6 Pounds |
Width | 9.13 Inches |
Part Number | QUA24529 |
Model | QUA24529 |
More information #ad
6. Amazon Basics
#ad
White, 500 ct, Amazon Basics #9 Double Window Security Tinted Envelopes
#adAmazon Basics #ad - 500 standard-size security-tinted #9 double window envelopes. 9 envelopes measures 3-7/8 by 8-7/8 inches each. Ideal for 8.More information #ad
5-by-11-inch computer-generated invoices and statements. Double windows 3/8-inch from the left to show sender info 2 inches from bottom and recipient info 1/2 inch from bottom.Brand | Amazon Basics #ad |
Manufacturer | Amazon Basics #ad |
Height | 0.01 Inches |
Length | 8.88 Inches |
Weight | 0.1 Pounds |
Width | 9.25 Inches |
Part Number | AMZ92W |
Model | AMZ92W |
More information #ad
7. Office Depot
#ad
9 3 7/8in. x 8 7/8in., Clean SealTM, 77166, Office Depot Double-Window Envelopes, White, Box of 250
#adOffice Depot #ad - Great for businesses that use check-writing software and computer-generated forms, double-window envelopes clearly display addresses from the inside. Make mailing labels a thing of the past in your office with these Office Depot envelopes.More information #ad
Security tint inside provides confidentiality. Includes an office depot clean seal double-window envelopes #9 box of 250 Self-adhesive closure keeps the contents safely inside. White double-window envelopes measure 3-7/8" x 8-7/8". Windows clearly display return and mailing address.Brand | Office Depot #ad |
Manufacturer | Office Depot #ad |
Length | 8.88 Inches |
Part Number | MPA/OD/156 |
More information #ad
8. Blue Summit Supplies
#ad
500 No. 9 Double Window Security Envelopes, Number 9 Size 3 7/8 Inch X 8 7/8 Inch, Designed for Quickbooks Invoices and Business Statements with Self Seal Peel and Seal Flap
#adBlue Summit Supplies #ad - Our self seal design is quick and easy and is guaranteed to stay sealed with no need for tape or glue sticks. Just peel and seal to create a strong lasting seal without licking or moistening.Quickly and easily stuff our wide envelopes with several invoices or business statements. Maintains professional look and feel throughout transit with our durable 24 LB white wove envelope paper.
More information #ad
Perfectly fits quickbooks invoices and business billing statements: sender and return address will be visible on your QuickBooks invoices and monthly bills through our unique two window design. Provides complete business mail security: your invoices and statements will be completely hidden with our dark security tint design.Brand | Blue Summit Supplies #ad |
Manufacturer | Blue Summit Supplies #ad |
Height | 4.5 Inches |
Length | 8.5 Inches |
Width | 12 Inches |
Part Number | BSS-92588-002 |
Model | BSS-92588-002 |
More information #ad
9. Columbian
#ad
Peel & Seal, White, 3-7/8 x 8-7/8 Inches, for Invoices and Statements, 500 per Box COLO166, Columbian #9 Double-Window Security Envelopes
#adColumbian #ad - Columbian #9 double window envelopes have a patented SimplySafe seal that will show signs of tampering, safeguarding against unauthorized opening. Protect critical documents or your customers' sensitive data; these tinted envelopes have a reflex blue pattern that obscures the details of what's inside.Box of 500 columbian white double window #9 envelopes 3-7/8" x 8-7/8" with a SimplySafe tamper-evident seal and peel off Release & Seal closure; top window: 7/8" x 3 1/2"; bottom window: 1" x 4".
More information #ad
Each #9 envelope is easy to open and close; simply remove the Release & Seal strip and press the flap closed for a clean, sanitary seal; use the pull strip to open without difficulty. Stock up on boxes of 500 window envelopes and save; great for bulk mailings, these number 9 envelopes show sender and receiver addresses and can be run through a postage machine.Brand | Columbian #ad |
Manufacturer | TOPS Products #ad |
Height | 3.75 Inches |
Length | 12.13 Inches |
Width | 9.13 Inches |
Part Number | COLO166 |
Model | COLO166 |
More information #ad
10. Office Depot
#ad
76169, Pack of 500, Office Depot 100% Recycled Lift PressTM Double-Window Envelopes, White, 9 3 7/8in. x 8 7/8in.
#adOffice Depot #ad - Tamper-evident seal provides added protection. Simply lift and press! lift & press closure provides a permanent seal immediately upon contact, so you can be sure that your documents will safely arrive at their destination. Made of crisp 24-lb white wove for a substantial feel.More information #ad
With office depot double-window recycled envelopes, there's no need to write out labels. Plus, you can easily see addresses with these double-window envelopes. Office depot lift & Press white envelopes are security-tinted inside for privacy and confidentiality. Windows display the return and mailing address.Brand | Office Depot #ad |
Manufacturer | Office Depot #ad |
Part Number | ODP76169 |
More information #ad