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Perfect for mailing invoices, billing statements, QuickBooks Invoices and checks, checks, and other business mail. Your business mail recipient address will show through the single window and you can quickly print your return address or add return address labels.

Easy read single window; perfect for bulk mailing, easy read 4-1/2 x 1-1/8 poly-window, each envelope has a premium, positioned 7/8" from the left and 1/2" from the bottom of the envelope, extra large, perfect for displaying addresses or business information, making slow printing and hand addressing a thing of the past.
10 single window security envelopes; forget cheap, our #10 security envelopes are premium quality, thin envelopes that allow contents to be easily read, ultra secure envelopes suitable for everyday business and legal mailing while protecting sensitive contents and information.

Single left window security envelopes; tired of cheap paper envelopes that can be easily seen through? Our single left Window Security Envelopes are ultra-secure and perfect for mailing invoices, statements and legal documents, with secure moisture activated gummed seal and tinted security wave patterns.
Easy read single window; perfect for bulk mailing, extra large, positioned 7/8" from the left and 1/2" from the bottom of the envelope, easy read 4-1/2 x 1-1/8 poly-window, each envelope has a premium, perfect for displaying addresses or business information, making slow printing and hand addressing a thing of the past.

Our dark security tint design provides complete business mail security so your professional business mail will be completely hidden from view during transit.
Smaller #9 or #8 return envelopes will fit inside to get your invoices paid quicker. Your business mail recipient address will show through the single window and you can quickly print your return address or add return address labels. Create professional looking mail with the added security of a single window envelope.

Your business mail recipient address will show through the single window and you can quickly print your return address or add return address labels.

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.
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.



Single window:single window envelopes for easy printing, labeling or perfect for quick, mass business mailings. Mail invoices, statements and other important documents with confidence.
Peel & seal closure: with the peel & seal closure, envelopes do not require licking to seal. Quality: our security self seal envelopes made of 24-lb white wove. 500 envelopes in each box: our #10 4 1/8" x 9 1/2" envelopes ideal for any document from official business letters to business check. Privacy: protect confidential client information with our security tinted envelopes.
1. Amazon Basics
#ad
Peel & Seal Closure, 500-Pack, Amazon Basics #10 Security-Tinted Self-Seal Business Envelopes with Left Window, White
#adAmazon Basics #ad - Includes 500 #10 envelopes made of 24-pound white woven paper for quality and strength. Product dimensions: 4-1/8 x 9-1/2 inches. 10 business letter envelopes with single left address window.More information #ad
Peel-and-seal closure; no moisture needed. Interior security tint for privacy; securely send checks, invoices, or other confidential documents.Brand | Amazon Basics #ad |
Manufacturer | Amazon Basics #ad |
Part Number | AMZA26 |
Model | AMZA26 |
More information #ad
2. Blue Summit Supplies
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Number 10 Size 4 1/8 X 9 1/2, Computer Printed Checks with Strong Peel and Seal Flap, 500 No. 10 Self Seal Single Window Security Envelopes -Designed for QuickBooks Invoices and Business Statements
#adBlue Summit Supplies #ad - Save time quickly stuffing multiple pieces of business mail in our wide and large #10 Security Envelope Design. You can even stuff smaller #9 or #8 return envelopes to get your invoices paid quicker.Perfect for mailing invoices, billing statements, QuickBooks Invoices and checks, checks, and other business mail. Your business mail recipient address will show through the single window and you can quickly print your return address or add return address labels.
More information #ad
Just peel and seal for a strong lasting seal. Provides complete business mail security: your professional business mail will be completely hidden with our dark security tint design. Our security envelopes will quickly and easily create a strong seal for completely secure business mail. Create professional looking mail with the added security of a single window envelope.Brand | Blue Summit Supplies #ad |
Manufacturer | Blue Summit Supplies #ad |
Part Number | BSS-92588-004 |
Model | BSS-92588-004 |
More information #ad
3. Aimoh
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500 Count 35210, 500#10 Single Left Window SELF Seal Security Envelopes, 24 LB, Super Strong Quick-Seal Self Sealing Closure, Size 4-1/8 x 9-1/2 Inches, Security Tinted
#adAimoh #ad - Ultra strong quick seal; manufactured with ultra strong, creating a super strong seal across the width of the envelope for a strong seal that won’t easily tear, perfect for mailing larger, quick seal adhesive, thicker documents. Security tint pattern; mailing secure documents? our #10 security Envelopes are designed with a security wave pattern on the inside to protect contents, data and numbers from being easily read, unlike other cheap envelopes.Easy read single window; perfect for bulk mailing, easy read 4-1/2 x 1-1/8 poly-window, each envelope has a premium, positioned 7/8" from the left and 1/2" from the bottom of the envelope, extra large, perfect for displaying addresses or business information, making slow printing and hand addressing a thing of the past.
More information #ad
Long lasting supply; ideal for everyday business use, perfect for invoices, each measuring 4-1/8 x 9-1/2 inches, each box provides 500 envelopes for a long lasting supply, statements and many more business uses! Click the Orange Button to order now.110 single window security envelopes; forget cheap, our #10 security envelopes are premium quality, thin envelopes that allow contents to be easily read, ultra secure envelopes suitable for everyday business and legal mailing while protecting sensitive contents and information.
Brand | Aimoh #ad |
Part Number | FBA_35210 |
Model | FBA_35210 |
More information #ad
4. Aimoh
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Gummed Closure, Size 4-1/8 X 9-1/2 inches, 24 LB, 500 Count 35310, #10 Single Left Window Security Tinted Envelopes
#adAimoh #ad - Long lasting supply; ideal for everyday business use, each measuring 4-1/8 x 9-1/2 inches, each box provides 500 envelopes for a long lasting supply, perfect for invoices, statements and many more business uses! Click the Orange Button to order now.Single left window security envelopes; tired of cheap paper envelopes that can be easily seen through? Our single left Window Security Envelopes are ultra-secure and perfect for mailing invoices, statements and legal documents, with secure moisture activated gummed seal and tinted security wave patterns.
More information #ad
Tinted security pattern; perfect for mailing invoices, easily obscuring numbers and data for premium, statements, legal documents and sensitive correspondence, standard business, our #10 single window Envelopes are printed with a secure tinted pattern, added security compared to other cheap envelopes. Easy read single window; perfect for bulk mailing, extra large, positioned 7/8" from the left and 1/2" from the bottom of the envelope, easy read 4-1/2 x 1-1/8 poly-window, each envelope has a premium, perfect for displaying addresses or business information, making slow printing and hand addressing a thing of the past.
Brand | Aimoh #ad |
Manufacturer | Aimoh #ad |
Part Number | 35310 |
More information #ad
5. Blue Summit Supplies
#ad
Number 10 Size 4 1/8” X 9 1/2”, 500 Pack, Designed for QuickBooks Invoices and Business Statements, Blue Summit Supplies 500#10 Single Window Security Envelopes Flip and Seal
#adBlue Summit Supplies #ad - Perfect for mailing invoices, QuickBooks invoices, billing statements, checks, and other business mail. Save time with our easy to use flip and seal design; with no need for licking or moistening, our self sealing design allows for sending hundreds of invoices quickly and easily and is guaranteed to stay sealed with no need for tape or glue sticks.Our dark security tint design provides complete business mail security so your professional business mail will be completely hidden from view during transit.
More information #ad
Save time by quickly stuffing multiple pieces of business mail in our wide and large #10 security envelope design. Smaller #9 or #8 return envelopes will fit inside to get your invoices paid quicker. Your business mail recipient address will show through the single window and you can quickly print your return address or add return address labels. Create professional looking mail with the added security of a single window envelope.
Brand | Blue Summit Supplies #ad |
Manufacturer | Blue Summit Supplies #ad |
Part Number | BSS-92588-038 |
Model | BSS-92588-038 |
More information #ad
6. Blue Summit Supplies
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Thick Gummed Seal, Designed for Secure Mailing of Quickbooks Checks, Invoices, Personal Letters, 4 1/8 x 9 1/2, Business Statements, 500 Number 10 Single Window Envelopes
#adBlue Summit Supplies #ad - Perfect for mailing invoices, billing statements, checks, QuickBooks Invoices and checks, and other business mail. Tamper proof design with our hot melt glue adhesive manufacturing process that allows the glue to penetrate the envelope, thus causing the envelope to tear if you open after sealing.Your business mail recipient address will show through the single window and you can quickly print your return address or add return address labels.
More information #ad
No need for tape or glue sticks as our strong gummed seal creates a hassle free and safe seal for all your sensitive documents. Provides complete business mail security: your professional business mail will be completely hidden with our dark security tint design. Create professional looking mail with the added security of a single window envelope.Brand | Blue Summit Supplies #ad |
Manufacturer | Blue Summit Supplies #ad |
Part Number | BSS-92588-011 |
More information #ad
7. HERKKA
#ad
24 LB, Designed for QuickBooks Invoices & Business Statements, 500#10 Single Left Window SELF Seal Security Envelopes, Computer Printed Checks Peel and Seal Flap Number 10 Size 4-1/8 x 9-1/2 Inches
#adHERKKA #ad - Easy read single window: thin security of single window envelopes makes the contents easily to read, create a professional looking, perfect for displaying recipient addresses or business information on the single window. Click the Orange Button to order now. 10 single window security envelopes: our #10 security envelopes are designed with SELF-SEAL strip—no moisture needed and a premium security tint, perfect for secure business and legal mailing, invoices, to protect sensitive data and information, or other confidential documents.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.
More information #ad
Long lasting supply: each box has 500 envelopes which can meet a long lasting supply, it’s fully compatible with most ink jet and laser printers, ideal for mass mailing of everyday business tasks! Our envelopes with smooth thick paper, can print quick and easily without worry about paper jams . 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.
Brand | HERKKA #ad |
Manufacturer | HERKKA #ad |
Part Number | No10-1Win-Lixing |
More information #ad
8. Quality Park
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White, 10 4 1/8" x 9 1/2", Box of 500, Quality Park Redi-Seal Security Window Envelopes
#adQuality Park #ad - Save time with quality park security envelopes that have built-in Redi-Seal technology closures - requires no moisture to seal! Quickly get that stack of papers delivered to important recipients. Addresses appear through window - no need to hand-address these security window envelopes.More information #ad
Security-tinted inside for privacy and confidentiality. Quality park envelopes feature a unique double flap design that keeps the gum from sticking before use. Simply raise the lower flap and press to seal.Brand | Quality Park #ad |
Manufacturer | 0 #ad |
Height | 4.1 Inches |
Length | 14.2 Inches |
Weight | 6.09 Pounds |
Width | 9.8 Inches |
Part Number | 21418 |
Model | 21418 |
More information #ad
9. CASHIER DEPOT YOUR ONE STOP SHOP FOR ALL CASHIER'S NEEDS
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100 Envelopes Left Window, 100 Cashier Depot #10 Business Envelope, Security-Tinted, 24lb. White Paper, Peel & Seal
#adCASHIER DEPOT YOUR ONE STOP SHOP FOR ALL CASHIER'S NEEDS #ad - Heavy 24lb White Paper. Made in USA. Standard 1-1/8" x 4-1/2" window positioned 7/8" from left and 1/2" from bottom. Peel & seal # 10 envelope 4 1/8 X 9 1/2. 100 envelopes Security Tinted.More information #ad
Brand | CASHIER DEPOT YOUR ONE STOP SHOP FOR ALL CASHIER'S NEEDS #ad |
Manufacturer | Cashier Depot #ad |
Part Number | BE10 |
More information #ad
10. Office Deed
#ad
Invoices, 4-1/8 x 9-1/2 Inches, Security Tint Pattern for Secure Mailing, Office Deed 500#10 Envelopes SELF SEAL Business Envelope Single Window Design, Statements & Legal Document
#adOffice Deed #ad - They come in boxes of 500, so you can stock up for long-term use. . Wove finish adds a professional touch. The blue tint pattern makes impossible to see the details of the contents, even when held up to the light.Single window:single window envelopes for easy printing, labeling or perfect for quick, mass business mailings. Mail invoices, statements and other important documents with confidence.
More information #ad
The liner keeps the gum dust-free before use. Simply press flaps together for a secure, strong seal. . Our products will the perfect fit for all official purpose with high standard quality. Peel & seal closure: with the peel & seal closure, envelopes do not require licking to seal. Quality: our security self seal envelopes made of 24-lb white wove. 500 envelopes in each box: our #10 4 1/8" x 9 1/2" envelopes ideal for any document from official business letters to business check. Privacy: protect confidential client information with our security tinted envelopes.
Brand | Office Deed #ad |
Manufacturer | Office Deed #ad |
Weight | 5.73 Pounds |
Part Number | SSESW |
More information #ad