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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.


Ultra strong quick seal; manufactured with ultra strong, perfect for mailing larger, quick seal adhesive, creating a super strong seal across the width of the envelope for a strong seal that won’t easily tear, 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.
Long lasting supply; ideal for everyday business use, each measuring 4-1/8 x 9-1/2 inches, perfect for invoices, each box provides 500 envelopes for a long lasting supply, statements and many more business uses! Click the Orange Button to order now.

Save time by quickly stuffing multiple pieces of business mail in our wide and large #10 security envelope design. Perfect for mailing invoices, billing statements, checks, QuickBooks invoices, and other business mail.
Our dark security tint design provides complete business mail security so your professional business mail will be completely hidden from view during transit.

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

Perfect for mailing invoices, billing statements, QuickBooks Invoices and checks, checks, and other business mail.10 left window envelopes; premium quality, suitable for everyday business and legal mailing. Easy read single window; perfect for quick mailing, extra-large, each envelope has a premium, 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, perfect for displaying addresses or business information, making slow printing and hand addressing a thing of the past.2

These white no-lick self-seal envelopes are used by businesses to mail documents with sensitive materials. Our business envelopes with security self-seal save you a ton of time with quick peel and seal action. We’d say we are the best business envelopes #10 that self-seal on Amazon.
Ditch the standard white letter size envelopes and replace them with our no 10 envelopes, Spark Ink spares no expense on thick, security self-seal design. 10: we specifically designed these single left side window #10 envelopes with a dark navy, heavy coverage security tint to provide guaranteed privacy for your legal or business mail. Crafted with thick, 24lb paper that ensures utmost privacy. Heavyweight security left window envelopes no. Never get fooled again: unlike, regular plain white envelopes, these no.

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.
Long lasting supply; ideal for everyday business use, each box provides 500 envelopes for a long lasting supply, each measuring 4-1/8 x 9-1/2 inches, perfect for invoices, statements and many more business uses! Click the Orange Button to order now.

Quality: our security self seal envelopes made of 24-lb white wove. Mail invoices, statements and other important documents with confidence.
Wove finish adds a professional touch. They come in boxes of 500, so you can stock up for long-term use. . The liner keeps the gum dust-free before use. Simply press flaps together for a secure, strong seal. . 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.

Maintain a professional look and feel throughout transit with our durable 24 lb white wove envelope paper. With no more headaches or bad tastes in your mouth from licking envelopes, easy, our self sealing design is quick, and guaranteed to stay sealed.
1. Blue Summit Supplies
#ad
Thick Gummed Seal, Designed for Secure Mailing of Quickbooks Checks, Business Statements, Number 10 Size 4 1/8 x 9 1/2, 500 No. 10 Single Window Envelopes, Invoices, Personal Letters
#adBlue Summit Supplies #ad - Save time quickly stuffing multiple pieces of business mail in our wide and large #10 Security Envelope Design. Your contents will stay sealed during transit with your strong gummed adhesive and unique 1’’ tapered gummed flap design.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.
More information #ad
Perfect for mailing invoices, checks, QuickBooks Invoices and checks, billing statements, and other business mail. You can even stuff smaller #9 or #8 return envelopes to get your invoices paid quicker. No need for tape or glue sticks as our strong gummed seal creates a hassle free and safe seal for all your sensitive documents.Brand | Blue Summit Supplies #ad |
Manufacturer | Blue Summit Supplies #ad |
Weight | 6.02 Pounds |
Part Number | FBA_BSS-92588-011 |
Model | FBA_BSS-92588-011 |
More information #ad
2. Amazon Basics
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White, Amazon Basics #10 Security-Tinted Self-Seal Business Envelopes with Left Window, Peel & Seal Closure, 500-Pack
#adAmazon Basics #ad - Interior security tint for privacy; securely send checks, invoices, or other confidential documents. 10 business letter envelopes with single left address window.More information #ad
Peel-and-seal closure; no moisture needed. 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.Brand | Amazon Basics #ad |
Manufacturer | Amazon Basics #ad |
Part Number | AMZA26 |
Model | AMZA26 |
More information #ad
3. Aimoh
#ad
500 Count 35210, #10 Single Left Window Self-Seal Security Tinted Envelopes, Size 4-1/8 X 9-1/2 Inches, 24 LB
#adAimoh #ad - 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.Ultra strong quick seal; manufactured with ultra strong, perfect for mailing larger, quick seal adhesive, creating a super strong seal across the width of the envelope for a strong seal that won’t easily tear, 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.
More information #ad
Easy read single window; perfect for bulk mailing, extra large, each envelope has a premium, perfect for displaying addresses or business information, easy read 4-1/2 X 1-1/8 poly-window, positioned 7/8" from the left and 1/2" from the bottom of the envelope, making slow printing and hand addressing a thing of the past. Long lasting supply; ideal for everyday business use, each measuring 4-1/8 x 9-1/2 inches, perfect for invoices, each box provides 500 envelopes for a long lasting supply, statements and many more business uses! Click the Orange Button to order now.
Brand | Aimoh #ad |
Part Number | FBA_35210 |
Model | FBA_35210 |
More information #ad
4. Blue Summit Supplies
#ad
500 Pack, Designed for QuickBooks Invoices and Business Statements, Number 10 Size 4 1/8” X 9 1/2”, Blue Summit Supplies 500#10 Single Window Security Envelopes Flip and Seal
#adBlue Summit Supplies #ad - Your business mail recipient address will show through the single window and you can quickly print your return address or add return address labels. Smaller #9 or #8 return envelopes will fit inside to get your invoices paid quicker.Save time by quickly stuffing multiple pieces of business mail in our wide and large #10 security envelope design. Perfect for mailing invoices, billing statements, checks, QuickBooks invoices, and other business mail.
More information #ad
Create professional looking mail with the added security of a single window envelope. 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.
Brand | Blue Summit Supplies #ad |
Manufacturer | Blue Summit Supplies #ad |
Part Number | BSS-92588-038 |
Model | BSS-92588-038 |
More information #ad
5. Blue Summit Supplies
#ad
Number 10 Size 4 1/8 X 9 1/2, 500 No. 10 Self Seal Single Window Security Envelopes -Designed for QuickBooks Invoices and Business Statements, Computer Printed Checks with Strong Peel and Seal Flap
#adBlue Summit Supplies #ad - Just peel and seal for a strong lasting seal. Perfect for mailing invoices, QuickBooks Invoices and checks, billing statements, checks, and other business mail. Provides complete business mail security: your professional business mail will be completely hidden with our dark security tint design.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
Save time quickly stuffing multiple pieces of business mail in our wide and large #10 Security Envelope Design. Create professional looking mail with the added security of a single window envelope. Our security envelopes will quickly and easily create a strong seal for completely secure business mail. You can even stuff smaller #9 or #8 return envelopes to get your invoices paid quicker.Brand | Blue Summit Supplies #ad |
Manufacturer | Blue Summit Supplies #ad |
Part Number | BSS-92588-004 |
Model | BSS-92588-004 |
More information #ad
6. Aimoh
#ad
Aimoh #10 Single Left Window Envelopes -Gummed Closure -Size 4-1/8x9-1/2 Inches -24LB-500 Count35410
#adAimoh #ad - 500 envelopes supply; ideal for everyday business use, each measuring 4-1/8 x 9-1/2 inches, perfect for invoices, each box provides 500 envelopes for a long-lasting supply, statements and many more business uses!.Perfect for mailing invoices, billing statements, QuickBooks Invoices and checks, checks, and other business mail.10 left window envelopes; premium quality, suitable for everyday business and legal mailing. Easy read single window; perfect for quick mailing, extra-large, each envelope has a premium, 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, perfect for displaying addresses or business information, making slow printing and hand addressing a thing of the past.2
More information #ad
24 lb white wove paper that creates a professional look and feel from out of the box all the way to your destination.Brand | Aimoh #ad |
Manufacturer | Aimoh #ad |
Part Number | 35410 |
More information #ad
7. Spark Ink
#ad
Peel & Seal, 500 Count Security Window Envelopes No.10, Plain Standard Size Business Check Envelopes 4-1/8 x 9-1/2 In, Left Window Self-Seal Envelopes #10, 24lb Paper, Self Stick Blank White Envelopes
#adSpark Ink #ad - Maximum strength self seal: unlike other strip and seal envelopes that need extra tape or glue, peel and seal adhesive that really sticks. 500 count of environmentally friendly and super convenient security envelopes. Our legal size envelopes are manufactured from well managed forests and are fully recyclable.These white no-lick self-seal envelopes are used by businesses to mail documents with sensitive materials. Our business envelopes with security self-seal save you a ton of time with quick peel and seal action. We’d say we are the best business envelopes #10 that self-seal on Amazon.
More information #ad
Perfect for check printing or sensitive documents: windowless blank design allows for easy address printing or labels for mass mailing or to simply keep a bulk supply on hand for your home office. Ditch the standard white letter size envelopes and replace them with our no 10 envelopes, Spark Ink spares no expense on thick, security self-seal design. 10: we specifically designed these single left side window #10 envelopes with a dark navy, heavy coverage security tint to provide guaranteed privacy for your legal or business mail. Crafted with thick, 24lb paper that ensures utmost privacy. Heavyweight security left window envelopes no. Never get fooled again: unlike, regular plain white envelopes, these no.
Brand | Spark Ink #ad |
Manufacturer | Spark Ink #ad |
Part Number | SPI-SEE-ENV-WIN |
More information #ad
8. Aimoh
#ad
24 LB, 500 Count 35310, Gummed Closure, Size 4-1/8 X 9-1/2 inches, #10 Single Left Window Security Tinted Envelopes
#adAimoh #ad - Tinted security pattern; perfect for mailing invoices, standard business, our #10 single window Envelopes are printed with a secure tinted pattern, easily obscuring numbers and data for premium, statements, legal documents and sensitive correspondence, added security compared to other cheap envelopes.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
Easy read single window; perfect for bulk mailing, 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, perfect for displaying addresses or business information, extra large, each envelope has a premium, making slow printing and hand addressing a thing of the past. Long lasting supply; ideal for everyday business use, each box provides 500 envelopes for a long lasting supply, each measuring 4-1/8 x 9-1/2 inches, perfect for invoices, statements and many more business uses! Click the Orange Button to order now.
Brand | Aimoh #ad |
Manufacturer | Aimoh #ad |
Part Number | 35310 |
More information #ad
9. Office Deed
#ad
Statements & Legal Document, Security Tint Pattern for Secure Mailing, Office Deed 500#10 Envelopes SELF SEAL Business Envelope Single Window Design, Invoices, 4-1/8 x 9-1/2 Inches
#adOffice Deed #ad - Peel & seal closure: with the peel & seal closure, envelopes do not require licking to seal. Our products will the perfect fit for all official purpose with high standard quality. Privacy: protect confidential client information with our security tinted envelopes.Quality: our security self seal envelopes made of 24-lb white wove. Mail invoices, statements and other important documents with confidence.
More information #ad
Single window:single window envelopes for easy printing, labeling or perfect for quick, mass business mailings. The blue tint pattern makes impossible to see the details of the contents, even when held up to the light. Wove finish adds a professional touch. They come in boxes of 500, so you can stock up for long-term use. . The liner keeps the gum dust-free before use. Simply press flaps together for a secure, strong seal. . 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.
Brand | Office Deed #ad |
Manufacturer | Office Deed #ad |
Weight | 5.73 Pounds |
Part Number | SSESW |
More information #ad
10. Blue Summit Supplies
#ad
Designed for Secure Mailing of Invoices, Documents, and Business Statements, Security Lining, 4 1/8 x 9 1/2 Inches, 500 Ct, 500 Self Seal Number 10 Single Right Window Envelopes
#adBlue Summit Supplies #ad - Just fold down flap and press to create a strong lasting seal. Our number 10 security envelope is perfect for mailing invoices, billing statements, and other business mail where the address is formatted on the right.Maintain a professional look and feel throughout transit with our durable 24 lb white wove envelope paper. With no more headaches or bad tastes in your mouth from licking envelopes, easy, our self sealing design is quick, and guaranteed to stay sealed.
More information #ad
Provides complete business mail security; your professional business mail will be completely hidden with our dark security tint design. Your business mail recipient address will show through the single right window, with your return address label added to the top left corner. 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-92588-032 |
More information #ad