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Dual window custom designed for mailing business checks: top window height is 7/8 inch x 3-1/2 inches wide and is positioned 3/8 inch from the left and 2-3/8 inch from the bottom, Bottom Window height is 7/8 inch X 3-1/2 inch wide and is positioned 7/8 inches from the left and 3/4 inches from the bottom.
Five hundred count: each box contains a long lasting Five Hundred envelope supply, ideal for business and home office use. Perfect secure design: measures perfectly 3 5/8 inch x 8 11/16 inch to prevent checks from sliding and moving unlike others on the market, securing sensitive information to remain hidden even through the two windows.

Perfect for home or office; securely send checks or other confidential documents. 500 pack self seal envelopes: herkka no9 security envelopes are designed with Peel and Seal closure—no moisture needed and a premium security tint to protect sensitive information and a super strong SELF-SEAL strip.
Double window design: only sender and return address will show on your QuickBooks invoices and monthly bills through our unique 2 window. Perfectly fits QuickBooks Invoices and business billing statements. 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.

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.

A security tint makes envelopes hard to see through; a security pattern scrambles the appearance of text; keeps contents safe from prying eyes, even if held to light. Quality park no. 8 double window envelopes are a perfect fit for QuickBooks & other computer checks; with security tint for privacy & a Redi Strip self seal closure for fast easy mail days; 500 per box.

Perfect secure design: measures perfectly 3 5/8 inch x 8 11/16 inch to prevent checks from sliding and moving, Address will show perfect through windows, Checks amounts and memos will not be visible. Peal and seal flap: just peel and seal to create a strong lasting seal, Our self seal design is quick and easy and is guaranteed to stay sealed throughout transit.


Long lasting supply: each box has 500 envelopes which can meet a long lasting supply, ideal for mass mailing of everyday business tasks! Our envelopes with smooth thick paper, it's fully compatible with most ink jet and laser printers, can print quick and easily without worry about paper jams.
Click the Orange Button to order now. You can use business mailing envelopes for sending invoices and checks. Ultra strong easy seal: #10 envelopes are manufactured with ultra 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 larger documents without splitting, is guaranteed to stay sealed with no need for tape or glue sticks.

Quick-seal closure; our #10 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 larger documents without splitting.
Windowless design; envelopes ideal for standard business & legal documents and sensitive correspondence, manufactured with a windowless front panel for easy printing, perfect for quick, labeling or hand-addressing, mass business mailings.


Laser and inkjet printer compatible; premium construction measuring 4-1/8 x 9-1/2 inches, fully compatible with most inkjet and laser printers for quick and easy addressing! Click the Orange Button to order now.
Super security tint pattern; #10 envelopes designed with a secure, security tint-pattern to protect contents and sensitive information, perfect for ultra-secure mailing. 100 envelope pack; these envelopes are manufactured with a window-less front panel for the perfect choice for small businesses, home offices and everyday use, #10 Security Envelopes are provided in a 100-envelope pack.
1. Aimoh
#ad
Not for Invoices, QuickBooks & Quicken Checks, 500 Count 30180, Checks Fit Perfectly, 500#8 Double Window Self Seal Security Envelopes, for Business Checks, Size 3 5/8 x 8 11/16 Inches
#adAimoh #ad - Quick-seal self seal strip: aimoh’s double window Security Tinted Self Seal Check Envelopes uses a premium adhesive peel and seal designed strip to create a strong, secure self-sealing seal. Premium security tint check envelopes: Ultra Secure security tint pattern - Double Window Security Tinted Check Envelopes.Dual window custom designed for mailing business checks: top window height is 7/8 inch x 3-1/2 inches wide and is positioned 3/8 inch from the left and 2-3/8 inch from the bottom, Bottom Window height is 7/8 inch X 3-1/2 inch wide and is positioned 7/8 inches from the left and 3/4 inches from the bottom.
More information #ad
Five hundred count: each box contains a long lasting Five Hundred envelope supply, ideal for business and home office use. Perfect secure design: measures perfectly 3 5/8 inch x 8 11/16 inch to prevent checks from sliding and moving unlike others on the market, securing sensitive information to remain hidden even through the two windows.
Brand | Aimoh #ad |
Manufacturer | Aimoh #ad |
Part Number | Aimoh |
Model | AE-BCSQS-30180-500 |
More information #ad
2. HERKKA
#ad
Number 9 Size 3 7/8 Inch X 8 7/8 Inch, 24 LB, 500 Count, #9 Double Window Security Envelopes, HERKKA No.9 Double Window Business Envelopes Designed for Quickbooks Invoices and Business Statements
#adHERKKA #ad - No show of memo, Payee line or amount in windows. Quick-seal closure: our no9 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.Perfect for home or office; securely send checks or other confidential documents. 500 pack self seal envelopes: herkka no9 security envelopes are designed with Peel and Seal closure—no moisture needed and a premium security tint to protect sensitive information and a super strong SELF-SEAL strip.
More information #ad
Premium security check tint envelopes: the interior of our No9 Security envelopes use a dark navy, heavy coverage security tint to provide guaranteed privacy for your legal or business mail, offer the protection contents and sensitive information, a security tint makes envelopes hard to see through that ensures upmost privacy. Double window design: only sender and return address will show on your QuickBooks invoices and monthly bills through our unique 2 window. Perfectly fits QuickBooks Invoices and business billing statements. 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.
Brand | HERKKA #ad |
Manufacturer | HERKKA #ad |
Part Number | No9-2Win-Lixing |
Model | No9-2Win-Lixing |
More information #ad
3. Blue Summit Supplies
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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 - Provides complete business mail security: your invoices and statements will be completely hidden with our dark security tint design. 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
Maintains professional look and feel throughout transit with our durable 24 LB white wove envelope paper. Quickly and easily stuff our wide envelopes with several invoices or business statements.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. Quality Park
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24 lb White, Redi-Strip Self Seal Closure, 3 5/8 x 8 11/16, 500 Count Pack of 1QUA50766, Quality Park #8 Double Window Security Envelopes for QuickBooks Checks
#adQuality Park #ad - Our no 8 mailing envelopes are a little bit wider and roomier than your standard check envelope; 3 5/8 x 8 11/16 inches wide to more easily fit wider QuickBooks checks & other computer laser checks.A security tint makes envelopes hard to see through; a security pattern scrambles the appearance of text; keeps contents safe from prying eyes, even if held to light. Quality park no. 8 double window envelopes are a perfect fit for QuickBooks & other computer checks; with security tint for privacy & a Redi Strip self seal closure for fast easy mail days; 500 per box.
More information #ad
Redi-strip peel and seal envelopes let you fly through your mail routine in record time; just peel & press for a durable adhesive seal without applying moisture. Double window envelopes display just the sender & receiver addresses; precise measurements keep check amounts and memo lines out of view.Brand | Quality Park #ad |
Manufacturer | TOPS Products #ad |
Height | 3.75 Inches |
Length | 12.13 Inches |
Width | 9.13 Inches |
Part Number | QUA50766 |
Model | QUA50766 |
More information #ad
5. Prime Business Checks
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Self Adhesive Peel & Seal White, Size 3 5/8 x 8 11/16-24lb NOT for INVOICES, Ultra Security Tinted, 500 Self Seal QuickBooks Double Window Security Check Envelopes, for Business Laser Checks
#adPrime Business Checks #ad - White wove paper, a super adhesive seal and a high-quality security pattern to ensure contents are kept in utmost security. Five hundred count: each box contains a long lasting Five Hundred envelope supply, ideal for business and home office use.Perfect secure design: measures perfectly 3 5/8 inch x 8 11/16 inch to prevent checks from sliding and moving, Address will show perfect through windows, Checks amounts and memos will not be visible. Peal and seal flap: just peel and seal to create a strong lasting seal, Our self seal design is quick and easy and is guaranteed to stay sealed throughout transit.
More information #ad
Check envelopes: designed to fit quickbooks Laser Checks or any Computer Business Checks, these business envelopes fit checks perfectly, with dual windows displaying essential information without leaking out sensitive details. Premium security: envelopes are made with thick 24 LB.Brand | Prime Business Checks #ad |
Manufacturer | Prime Business Checks #ad |
Height | 12 Inches |
Length | 8.69 Inches |
Weight | 4.8 Pounds |
Width | 3.62 Inches |
Part Number | PB-92663-500 |
Model | PB-92663-500 |
More information #ad
6. Splendoress
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Legal Size Regular Plain Envelopes 4-1/8 x 9-1/2 Inches, 24 LB Envelops, #10 Envelopes Letter Size Self Seal, Business White Security Tinted Peel and Seal, 500 Pack Windowless
#adSplendoress #ad - X 9 1/2 in size envelop. Ndaa section 889 Compliance Certfication. High quality & bulk pricing - 24lbs high quality envelopes at a fraction of the price. Long lasting supply - 500 count per box.More information #ad
Windowless envelope. Can't see through envelopes - Security printing pattern on the inside prevents from seeing what inside. No need to lick the flap anymore - Very convenient. Self seal envelope- just peel and stick 4 1/8 in.Brand | Splendoress #ad |
Manufacturer | Splendoress #ad |
Height | 4.25 Inches |
Length | 11.5 Inches |
Weight | 6.06 Pounds |
Width | 10 Inches |
Part Number | #10 Security Envelopes Windowless |
Model | #10 Security Envelopes Windowless |
More information #ad
7. HERKKA
#ad
Perfect Size for Multiple Business Statements, Quickbooks Invoices, 24 LB, 500#10 Double Window Security Business Mailing Envelopes, White, Number 10 Size 4-1/8 x 9-1/2, and Return Envelopes
#adHERKKA #ad - 10 security envelopes:our #10 double window envelopes can easily read dual windows for everyday business mailings and postal addresses. Premium security tinted pattern: #10 security envelopes are designed with a premium security printed design to provide guaranteed privacy for your legal or business mail, offer the protection contents and sensitive information, a security tint makes envelopes hard to see through that ensures upmost privacy.Long lasting supply: each box has 500 envelopes which can meet a long lasting supply, ideal for mass mailing of everyday business tasks! Our envelopes with smooth thick paper, it's fully compatible with most ink jet and laser printers, can print quick and easily without worry about paper jams.
More information #ad
It's the perfect for secure business mailing, invoices, checks, billing statements, everyday home and other business mail. Double window envelope design: envelopes with dual window allows sender and recipient address to show through our unique 2 window, secure envelopes suitable for everyday business, legal mailing, and business billing statements while protecting sensitive contents and information. Click the Orange Button to order now. You can use business mailing envelopes for sending invoices and checks. Ultra strong easy seal: #10 envelopes are manufactured with ultra 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 larger documents without splitting, is guaranteed to stay sealed with no need for tape or glue sticks.
Brand | HERKKA #ad |
Manufacturer | HERKKA #ad |
Part Number | HERKKA |
Model | HERKKA |
More information #ad
8. Aimoh
#ad
#10 Security Self-Seal Envelopes, Ultra Strong Quick-Seal Closure, EnveGuard, 24 LB, White, 500 Count 34010, Premium Security Tint Pattern, Windowless Design, Size 4-1/8 x 9-1/2 Inches
#adAimoh #ad - 10 security tinted self seal envelopes; forget cheap envelopes that easily split and aren't suitable for secure mailing, our #10 envelopes are designed with a premium security tint to protect sensitive information and a super strong SELF-SEAL strip, perfect for larger documents.Quick-seal closure; our #10 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 larger documents without splitting.
More information #ad
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! Premium security tinted pattern; our #10 envelopes are designed with a premium security printed design to protect contents and sensitive information, perfect for secure business and legal mailing while protecting sensitive information. Windowless design; envelopes ideal for standard business & legal documents and sensitive correspondence, manufactured with a windowless front panel for easy printing, perfect for quick, labeling or hand-addressing, mass business mailings.
Brand | Aimoh #ad |
Manufacturer | Aimoh #ad |
Height | 4.25 Inches |
Length | 11.5 Inches |
Width | 10 Inches |
Part Number | 34010-500 |
Model | 34010-500 |
More information #ad
9. Next Day Labels
#ad
Compatible for QuickBooks Checks, Blackbaud Software ETC, Box of 500, #9 Ready-Seal Double Window Security Tinted Check Envelopes, Sage 100 program
#adNext Day Labels #ad - Fold and seal - Security Tint Inside. Stop licking envelopes" Just fold the flap, get a quick, secure seal. Guaranteed to fit all your computer business checks. Made in the usa by Next Day Labels TM. Box of 500 #9 double window check Envelope, 3-7/8 X 8-7/8.More information #ad
Brand | Next Day Labels #ad |
Manufacturer | Next Day Labels #ad |
Weight | 0 Pounds |
Part Number | 6587 |
Model | 92664 |
More information #ad
10. Aimoh
#ad
EnveGuard, 24 LB, White, Size 4-1/8 X 9-1/2 Inches, 100 Count 34100, #10 Security Tinted Self-Seal Envelopes, No Window
#adAimoh #ad - Enveguard technology; in today's world where our health, privacy and security is so much threatened, at Aimoh we approve only the highest quality products, the team of engineers and developers at Aimoh have researched and developed the EnveGuard Technology and Approval systems, produced from the best and safest material on earth.Laser and inkjet printer compatible; premium construction measuring 4-1/8 x 9-1/2 inches, fully compatible with most inkjet and laser printers for quick and easy addressing! Click the Orange Button to order now.
More information #ad
Quick-seal closure; our #10 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. Super security tint pattern; #10 envelopes designed with a secure, security tint-pattern to protect contents and sensitive information, perfect for ultra-secure mailing. 100 envelope pack; these envelopes are manufactured with a window-less front panel for the perfect choice for small businesses, home offices and everyday use, #10 Security Envelopes are provided in a 100-envelope pack.
Brand | Aimoh #ad |
Manufacturer | Aimoh #ad |
Height | 2.2 Inches |
Length | 9.7 Inches |
Width | 4.3 Inches |
Part Number | 34100 |
Model | 34100 |
More information #ad