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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 replacement or 100% refund will be immediately provided to you. Windowless design: envelopes ideal for standard business & legal documents and sensitive correspondence, labeling or hand-addressing, manufactured with a windowless front panel for easy printing, perfect for quick, mass business mailings.
We are confident you would love our valbox products in its quality and price. Quick-seal closure: no glue sticks required. 10 security tinted self seal envelopes 200 count: forget poor quailty 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.



Store more, longer: reid-strip envelopes have a longer shelf-life thanks to the peel able strip that protects your adhesive from dust. An excellent value: bright white 24-lb paper makes an impression for business mailings and personal correspondence; get 100 4-1/8 x 9-1/2 inch envelopes.

Quickly stuff multiple pieces of business mail into our wide opening #10 security envelope design with large flip-and-seal opening.
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. Create a professional look for your mail all the way to its destination thanks to our durable 24 white wove paper and smooth front envelope with no windows.


No need to spend time and money stamping, or spending extra money on custom envelopes, adding return labels, just quickly slide in your business mail to create professional looking business mail.

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.
Windowless design; envelopes ideal for standard business & legal documents and sensitive correspondence, labeling or hand-addressing, perfect for quick, manufactured with a windowless front panel for easy printing, mass business mailings. 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.
1. Blue Summit Supplies
#ad
500 No. 9 Flip and Seal Double Window Security Envelopes, 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
#adBlue Summit Supplies #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.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
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. 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 |
More information #ad
2. ValBox
#ad
ValBox 200 Count #10 Self-Seal Security Envelopes, Business Envelopes, Windowless Design, Security Tint Pattern for Secure Mailing Envelopes, 4-1/8x9-1/2 Inches, White
#adValBox #ad - Premium security tinted pattern: these mailing envelopes feature high quality security patterns with heavy paper stock to protect confidential information, for absolute peace of mind when mailing sensitive information. However, if there's anything make you unhappy or unsatifaction, please do contact us without any hesitation.A replacement or 100% refund will be immediately provided to you. Windowless design: envelopes ideal for standard business & legal documents and sensitive correspondence, labeling or hand-addressing, manufactured with a windowless front panel for easy printing, perfect for quick, mass business mailings.
More information #ad
With a easy peel-off strip that reveals a strong, permanent adhesive that won’t rip or tear even through long haul journeys. We are confident you would love our valbox products in its quality and price. Quick-seal closure: no glue sticks required. 10 security tinted self seal envelopes 200 count: forget poor quailty 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.
Brand | ValBox #ad |
Manufacturer | ValBox #ad |
Part Number | VB011 |
More information #ad
3. Quality Park
#ad
White, 500 Envelopes 67218, Quality Park Reveal-N-Seal Business Security Envelope, 4.125 x 9.5 Inches, 10
#adQuality Park #ad - Security tinted inside for privacy of contents. Unique and aggressive adhesive provides a strong, moisture-free secure seal. Small perforations along the flaps, which provide better evidence of tampering. 6 times longer shelf life than standard latex adhesive envelopes.More information #ad
Brand | Quality Park #ad |
Manufacturer | Quality Park #ad |
Height | 9.81 Inches |
Length | 14.18 Inches |
Weight | 6.4 Pounds |
Width | 4.12 Inches |
Part Number | 67218 |
Model | 67218 |
More information #ad
4. Top Flight
#ad
Strip & Seal, Security Tinted, 24 lb, White Paper, 500 Count, Top Flight PSTF10NWT #10 Envelopes
#adTop Flight #ad - Heavy 24lb white paper - made in USA. 500 count per box. Strip & seal closure. Security tinted. Standard 10 envelope 4 1/8 x 9 1/2.More information #ad
Brand | Top Flight #ad |
Manufacturer | Top Flight #ad |
Height | 4.3 Inches |
Length | 11.8 Inches |
Weight | 6.05 Pounds |
Width | 10 Inches |
Part Number | PSTF10NWT |
Model | PSTF10NWT |
Warranty | #10 |
More information #ad
5. Quality Park
#ad
4-1/8" x 9-1/2", Quality Park #10 Self-Seal Security Envelopes, 24-lb White Wove, Security Tint and Pattern, 100/Box QUA69117, Redi-Strip Closure
#adQuality Park #ad - Save time with self-stick: quality park #10 Security Envelopes have a strong peel & stick closure that helps you fly through mailings in record time.Store more, longer: reid-strip envelopes have a longer shelf-life thanks to the peel able strip that protects your adhesive from dust. An excellent value: bright white 24-lb paper makes an impression for business mailings and personal correspondence; get 100 4-1/8 x 9-1/2 inch envelopes.
More information #ad
Less yuck: we promise you won't miss licking envelopes or crumbly, drippy sponges; complete your mailings, no accessories required. Enhanced security: offer the protection clients deserve; a security tint makes envelopes hard to see through; a security pattern scrambles the appearance of text.Brand | Quality Park #ad |
Manufacturer | Quality Park #ad |
Height | 2.03 Inches |
Length | 9.63 Inches |
Weight | 0.91 Pounds |
Width | 4.25 Inches |
Part Number | QUA69117 |
Model | QUA69117 |
More information #ad
6. Blue Summit Supplies
#ad
Security Tint, Blue Summit Supplies 500 Number 10 Envelopes Self Seal, 4 1/8 x 9 1/2-500 Count, Flip and Seal Flap, Number 10 Business Envelopes Letter Size
#adBlue Summit Supplies #ad - Smaller #9 or #8 return envelopes will easily fit inside so you can get your invoices paid quicker. Provides complete mail security with no need to worry about others seeing your documents, thanks to our dark black security tint lining which completely hides your confidential mail.Quickly stuff multiple pieces of business mail into our wide opening #10 security envelope design with large flip-and-seal opening.
More information #ad
Designed for secure everyday home and business mailings, our windowless number 10 security envelopes are a perfect fit for standard 8. 5'' x 11'' paper sizes and other folded letter or legal size documents. 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. Create a professional look for your mail all the way to its destination thanks to our durable 24 white wove paper and smooth front envelope with no windows.
Brand | Blue Summit Supplies #ad |
Manufacturer | Blue Summit Supplies #ad |
Part Number | BSS-92588-033 |
More information #ad
7. Amazon Basics
#ad
Amazon Basics #10 Security-Tinted Envelopes with Peel & Seal, 500-Pack, White
#adAmazon Basics #ad - Ideal for home or office; securely send checks, invoices, or other confidential documents. Interior security tint keeps content private.More information #ad
500-pack of #10 security envelopes with Peel & Seal closure—no moisture needed. 24-pound white woven paper for quality and strength. Measures 4-1/8 by 9-1/2 inches each.Brand | Amazon Basics #ad |
Manufacturer | Amazon Basics #ad |
Part Number | AMZP5 |
Model | AMZP5 |
More information #ad
8. Blue Summit Supplies
#ad
Perfect Size for Multiple Business Statements, Quickbooks Invoices, and Return Envelopes, Number 10 Size 4 1/8 Inch X 9 ½ Inch, 500 No. 10 Self Seal Double Window Security Envelopes
#adBlue Summit Supplies #ad - Provides complete business mail security: your business mail will be completely hidden with our dark security tint design. Perfect for mailing invoices, billing statements, QuickBooks Invoices, checks, and other business mail.No need to spend time and money stamping, or spending extra money on custom envelopes, adding return labels, just quickly slide in your business mail to create professional looking business mail.
More information #ad
Your return and sender address will line up perfectly. 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. Just peel and seal for a strong lasting seal. 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 |
Height | 4.4 Inches |
Length | 11.9 Inches |
Width | 10.1 Inches |
Part Number | BSS-92588-003 |
Model | 74689 |
More information #ad
9. Aimoh
#ad
White, 24 LB, EnveGuard, 500 Count 34010, Windowless Design, Premium Security Tint Pattern, #10 Security Self-Seal Envelopes, Ultra Strong Quick-Seal Closure, Size 4-1/8 x 9-1/2 Inches
#adAimoh #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! Click the Orange Button to order now. 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.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.
More information #ad
Windowless design; envelopes ideal for standard business & legal documents and sensitive correspondence, labeling or hand-addressing, perfect for quick, manufactured with a windowless front panel for easy printing, mass business mailings. 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.
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