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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, each envelope has a premium, easy read 4-1/2 X 1-1/8 poly-window, extra large, positioned 7/8" from the left and 1/2" from the bottom of the envelope, perfect for displaying addresses or business information, making slow printing and hand addressing a thing of the past.
Long lasting supply; ideal for everyday business use, perfect for invoices, each box provides 500 envelopes for a long lasting supply, each measuring 4-1/8 x 9-1/2 inches, statements and many more business uses! Click the Orange Button to order now. Ultra strong quick seal; manufactured with ultra strong, quick seal adhesive, perfect for mailing larger, creating a super strong seal across the width of the envelope for a strong seal that won’t easily tear, thicker 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.

Our dark security tint design provides complete business mail security so your professional business mail will be completely hidden from view during transit.
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. Perfect for mailing invoices, billing statements, QuickBooks invoices, checks, and other business mail.

Provides complete business mail security: your professional business mail will be completely hidden with our dark security tint design.

Simply press flaps together for a secure, strong seal. . The blue tint pattern makes impossible to see the details of the contents, even when held up to the light.
Mail invoices, statements and other important documents with confidence. Privacy: protect confidential client information with our security tinted envelopes. Our products will the perfect fit for all official purpose with high standard quality. Single window:single window envelopes for easy printing, labeling or perfect for quick, mass business mailings.

Your business mail recipient address will show through the single right window, with your return address label added to the top left corner. Just fold down flap and press to create a strong lasting seal.

Perfect for mailing invoices, checks, billing statements, QuickBooks Invoices and checks, and other business mail.1

Our business envelopes with security self-seal save you a ton of time with quick peel and seal action. 10 window envelopes tear when opened! Exclusive tamper evident slits provide increased security to prevent careful opening and resealing.
Our legal size envelopes are manufactured from well managed forests and are fully recyclable. 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. These white no-lick self-seal envelopes are used by businesses to mail documents with sensitive materials.

Simply raise the lower flap and press to seal. Mail invoices, statements and other important documents with confidence.
Display the receiver addresses through the window. Redi-seal self adhesive closure: with the redi-seal closure, envelopes do not require moisture to seal. The unique double-flap design keeps the gum from sticking before use.
1. Aimoh
#ad
Size 4-1/8 X 9-1/2 Inches, #10 Single Left Window Self-Seal Security Tinted Envelopes, 24 LB, 500 Count 35210
#adAimoh #ad - 10 single window security envelopes; forget cheap, thin envelopes that allow contents to be easily read, our #10 security envelopes are premium quality, ultra secure envelopes suitable for everyday business and legal mailing while protecting sensitive contents and information.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, each envelope has a premium, easy read 4-1/2 X 1-1/8 poly-window, extra large, positioned 7/8" from the left and 1/2" from the bottom of the envelope, 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 box provides 500 envelopes for a long lasting supply, each measuring 4-1/8 x 9-1/2 inches, statements and many more business uses! Click the Orange Button to order now. Ultra strong quick seal; manufactured with ultra strong, quick seal adhesive, perfect for mailing larger, creating a super strong seal across the width of the envelope for a strong seal that won’t easily tear, thicker documents.
Brand | Aimoh #ad |
Part Number | FBA_35210 |
Model | FBA_35210 |
More information #ad
2. Amazon Basics
#ad
White, Peel & Seal Closure, 500-Pack, Amazon Basics #10 Security-Tinted Self-Seal Business Envelopes with Left Window
#adAmazon Basics #ad - Product dimensions: 4-1/8 x 9-1/2 inches. Interior security tint for privacy; securely send checks, invoices, or other confidential documents.More information #ad
Includes 500 #10 envelopes made of 24-pound white woven paper for quality and strength. 10 business letter envelopes with single left address window. Peel-and-seal closure; no moisture needed.Brand | Amazon Basics #ad |
Manufacturer | Amazon Basics #ad |
Part Number | AMZA26 |
Model | AMZA26 |
More information #ad
3. 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 - You can even stuff smaller #9 or #8 return envelopes to get your invoices paid quicker. Just peel and seal for a strong lasting seal. Your business mail recipient address will show through the single window and you can quickly print your return address or add return address labels.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.
More information #ad
Perfect for mailing invoices, checks, QuickBooks Invoices and checks, billing statements, and other business mail. Save time quickly stuffing multiple pieces of business mail in our wide and large #10 Security Envelope Design. Our security envelopes will quickly and easily create a strong seal for completely secure business mail.Brand | Blue Summit Supplies #ad |
Manufacturer | Blue Summit Supplies #ad |
Part Number | BSS-92588-004 |
Model | BSS-92588-004 |
More information #ad
4. Blue Summit Supplies
#ad
Blue Summit Supplies 500#10 Single Window Security Envelopes Flip and Seal, 500 Pack, Designed for QuickBooks Invoices and Business Statements, Number 10 Size 4 1/8” X 9 1/2”
#adBlue Summit Supplies #ad - 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.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. 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. Perfect for mailing invoices, billing statements, QuickBooks invoices, checks, and other business mail.
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
Thick Gummed Seal, 500 Number 10 Single Window Envelopes, 4 1/8 x 9 1/2, Invoices, Business Statements, Designed for Secure Mailing of Quickbooks Checks, Personal Letters
#adBlue Summit Supplies #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. Your business mail recipient address will show through the single window and you can quickly print your return address or add return address labels.Provides complete business mail security: your professional business mail will be completely hidden with our dark security tint design.
More information #ad
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. Perfect for mailing invoices, checks, QuickBooks Invoices and checks, billing statements, and other 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 |
Weight | 6.15 Pounds |
Part Number | BSS-92588-011 |
More information #ad
6. Office Deed
#ad
Invoices, Security Tint Pattern for Secure Mailing, 4-1/8 x 9-1/2 Inches, Office Deed 500#10 Envelopes SELF SEAL Business Envelope Single Window Design, Statements & Legal Document
#adOffice Deed #ad - Wove finish adds a professional touch. They come in boxes of 500, so you can stock up for long-term use. . Quality: our security self seal envelopes made of 24-lb white wove. The liner keeps the gum dust-free before use.Simply press flaps together for a secure, strong seal. . The blue tint pattern makes impossible to see the details of the contents, even when held up to the light.
More information #ad
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. Peel & seal closure: with the peel & seal closure, envelopes do not require licking to seal. Mail invoices, statements and other important documents with confidence. Privacy: protect confidential client information with our security tinted envelopes. Our products will the perfect fit for all official purpose with high standard quality. Single window:single window envelopes for easy printing, labeling or perfect for quick, mass business mailings.
Brand | Office Deed #ad |
Manufacturer | Office Deed #ad |
Weight | 5.73 Pounds |
Part Number | SSESW |
More information #ad
7. Blue Summit Supplies
#ad
Security Lining, Designed for Secure Mailing of Invoices, Documents, and Business Statements, 500 Ct, 4 1/8 x 9 1/2 Inches, 500 Self Seal Number 10 Single Right Window Envelopes
#adBlue Summit Supplies #ad - Maintain a professional look and feel throughout transit with our durable 24 lb white wove envelope paper. 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. Just fold down flap and press to create a strong lasting seal.
More information #ad
Create professional looking mail with the added security of a single window envelope. With no more headaches or bad tastes in your mouth from licking envelopes, our self sealing design is quick, easy, and guaranteed to stay sealed. Our number 10 security envelope is perfect for mailing invoices, billing statements, and other business mail where the address is formatted on the right.Brand | Blue Summit Supplies #ad |
Manufacturer | Blue Summit Supplies #ad |
Part Number | BSS-92588-032 |
More information #ad
8. Aimoh
#ad
Aimoh #10 Single Left Window Envelopes -Gummed Closure -Size 4-1/8x9-1/2 Inches -24LB-500 Count35410
#adAimoh #ad - Easy read single window; perfect for quick mailing, perfect for displaying addresses or business information, 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, making slow printing and hand addressing a thing of the past.Perfect for mailing invoices, checks, billing statements, QuickBooks Invoices and checks, and other business mail.1
More information #ad
10 left window envelopes; premium quality, suitable for everyday business and legal mailing. 24 lb white wove paper that creates a professional look and feel from out of the box all the way to your destination. 500 envelopes supply; ideal for everyday business use, perfect for invoices, each box provides 500 envelopes for a long-lasting supply, each measuring 4-1/8 x 9-1/2 inches, statements and many more business uses!.Brand | Aimoh #ad |
Manufacturer | Aimoh #ad |
Part Number | 35410 |
More information #ad
9. Spark Ink
#ad
Plain Standard Size Business Check Envelopes 4-1/8 x 9-1/2 In, Left Window Self-Seal Envelopes #10, Peel & Seal, 500 Count Security Window Envelopes No.10, Self Stick Blank White Envelopes, 24lb Paper
#adSpark Ink #ad - Never get fooled again: unlike, regular plain white envelopes, these no. Heavyweight security left window envelopes no. 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.Our business envelopes with security self-seal save you a ton of time with quick peel and seal action. 10 window envelopes tear when opened! Exclusive tamper evident slits provide increased security to prevent careful opening and resealing.
More information #ad
Crafted with thick, 24lb paper that ensures utmost privacy. We’d say we are the best business envelopes #10 that self-seal on Amazon. 500 count of environmentally friendly and super convenient security envelopes. Environmentally friendly: rest easy when you send a letter. Our legal size envelopes are manufactured from well managed forests and are fully recyclable. 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. These white no-lick self-seal envelopes are used by businesses to mail documents with sensitive materials.
Brand | Spark Ink #ad |
Manufacturer | Spark Ink #ad |
Part Number | SPI-SEE-ENV-WIN |
More information #ad
10. Quality Park
#ad
24 lb. White Wove, 4-1/8 x 9-1/2, Quality Park #10 Left Window Security Tinted Envelopes with a Self Seal Closure for Standard Business Mailings, 500 per Box 21418
#adQuality Park #ad - 500 envelopes in each box: ideal for both everyday office use and bulk mailings, each box of Quality Park #10 Left Window Security Tinted Envelopes provides a long lasting supply for your Standard Business Mailings! Single window envelope: instead of printing both the contents and the envelopes with an address, use the window to reveal pertinent information.Simply raise the lower flap and press to seal. Mail invoices, statements and other important documents with confidence.
More information #ad
The reflex blue pattern lining the envelope's interior makes it impossible to see the details of the contents, even when held up to the light. Positioned to fit most invoice address layouts, this left side window envelope not only saves time but also makes sure the document is delivered straight into the customer's hands! Enhanced privacy features: protect sensitive client information with these security tinted envelopes. Display the receiver addresses through the window. Redi-seal self adhesive closure: with the redi-seal closure, envelopes do not require moisture to seal. The unique double-flap design keeps the gum from sticking before use.
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