Top 10 Best 9 envelopes in 2026

Last Updated - 6/17/2026

🏆Best Choice

Mead

Mead #10 Security Business Envelopes Letter Size 4-1/8" x 9-1/2" – Peel and Seal, Privacy Lined, No-Window, Press-It Seal-It Self-Adhesive for Home & Office Mailing, 45 Count (75026)

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•STANDARD SIZE – Easily send everyday mail. These #10 size envelopes measure 4-1/8" x 9-1/2" and can hold folded letter-size documents.
•SECURE SEAL – Quick and simple sealing. Mead Press-It Seal-It envelopes feature a self-adhesive strip to help keep your contents safe and secure.
•SECURITY LINING – Keep your personal information personal. These envelopes have a security lining to help maintain privacy of your documents.
•USE ANYWHERE – These all-purpose 20 lb. white envelopes are great for both office and home use. Made in the U.S.A.
•VALUE PACK – Stock up on your supplies. This box contains 45 envelopes. Made with SFI (Sustainable Forest Initiative) certified sourcing.

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$3.57

$5.54

-36%

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Amazon Basics

Amazon Basics Clasp Kraft Envelopes, Gummed Mailing Envelope, 9 x 12 inch, 100-Pack

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•Clasp envelope (100-pack) for filing, storing, or mailing documents
•Double-prong metal clasp closure and reinforced eyelet keep documents securely contained
•Moisture-activated gummed surface on flap creates a permanent seal
•Made with thick 28-pound kraft paper for reliable strength and protection
•Measures 9 by 12 inches each; backed by an Amazon Basics 1-year limited warranty

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$13.98

$15.66

-11%

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Amazon Basics

Amazon Basics Catalog Mailing Envelopes, Peel and Seal, 9x12 Inch, 100-Pack, White

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•#10-1/2 catalog envelopes (100-pack), each measuring 9 x 12 inches
•Easy peel-and-seal closure; no moisture needed
•Made of 28-pound white woven paper for quality and strength
•Ideal for mailing catalogs, booklets, brochures, and multi-page documents

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$13.00

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Mead

Mead Envelopes, 9" x 12", Clasp Closure, Brown Kraft All-Purpose 24-lb Paper Mailing Envelopes, 20 Count (76020)

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•Keep plenty of these envelopes on hand at home or the office to mail documents, invitations or professional correspondence
•Features a clasp closure to keep documents extra secure
•Made of heavyweight brown kraft material
•Pack includes 20 envelopes, each envelope measuring 6" x 12"
•Made in the U.S.A

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$6.32

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Amazon Basics

Amazon Basics #9 Self-Seal Envelopes with Peel and Seal, Double Window, Security Tinted, 500-Pack, 1 X 3.88 X 8.8 inch, White

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•500-count pack of #9 security envelopes with Peel & Seal closure―no moisture needed
•Interior security tint keeps content private; securely send checks, invoices, or other confidential documents
•Double window allows sender and recipient addresses to show through
•24-pound white wove paper for quality and strength; ideal for home or office
•Measures 3-7/8 by 8-7/8 inches each

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$24.94

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Columbian

Columbian #9 Security Envelopes, No Window, Self Seal, for Invoices & QuickBooks Statements, 3-7/8 x 8-7/8 Inches, 24 lb White, 500/Box (COLO183)

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•Large supply of 500 white #9 business envelopes protect your customers’ sensitive data; a reflex blue pattern safely obscures what’s inside; windowless 3 7/8 x 8 7/8 design for invoices & statements
•Release & Seal envelopes seal without moisture to save you loads of time; protective strips give envelopes a longer shelf life by shielding the adhesive from dust
•Guard your clients personal information with a security tint that makes envelopes hard to see through; a dense security pattern scrambles the appearance of text even when held to light
•For QuickBooks statements, invoices, or any sensitive business or legal correspondence; a windowless design gives you greater flexibility and protection from prying eyes
•An excellent value; get 500 bright white 24-lb envelopes that make an impression for business mailings and personal correspondence

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$23.56

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EnDoc

#9 Envelopes Self Seal - 100 Pack - Security Tinted 3 7/8" x 8 7/8" Business Envelopes Peel & Seal - Mailing Envelopes Letter Size - Legal Envelopes for Invoices, Statements - 24lb Plain Envelopes

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Privacy Tinted: Our pure white no. 9 envelopes feature traditional V-shaped flaps and dual diagonal seams for formal mailing, slimline cards, and invitations. The tinted pattern obscures the contents making it difficult for others to see through.
•Compact Size: Envelopes #9 compact dimensions - 3 7/8"x8 7/8" or 9.84x20.32 cm. Fit a 3-folded piece of 8 1/2"x11" piece of paper perfectly. They also fit neatly inside #10 envelopes, eliminating the need for folding when sending return envelopes.
•Envelopes Self Seal: Peel & seal closure designed to make envelope sealing effortless. Simply peel off the protective strip and press to seal - no more licking required. This hassle-free closure saves you time and effort.
•Printer-Friendly Design: The windowless design of our white 24 lb paper envelopes letter size provides a printable surface for easier print labeling or hand addressing. This makes them perfect for business mailing or hand addressing for home use.
•Optimal Quantity: 100 pack of #9 mailing envelopes is perfect for regular use without the need for excessive spending on bulk 500 packs. It enables you to try different envelope types and sizes to find the best option for your home & business needs.

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$15.99

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EnDoc

EnDoc 500#9 Envelopes Self Seal, 3 7/8 x 8 7/8" Security Tinted White Envelopes No Window for Invoices & Statements, Business Mailing Envelopes no 9 Peel & Seal, 24lb Paper

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Perfect for Business Mail: Specifically designed to accommodate invoices, statements, and other business correspondence, these #9 self-seal no window envelopes (3 7/8" x 8 7/8") ensure a clean, professional presentation.
•Windowless Design: The absence of windows provides enhanced privacy and security for your documents, ensuring that sensitive information remains confidential and out of sight during transit.
•Convenient Self-Sealing Envelopes: No moisture needed. Simply peel and seal with the quick self-adhesive strip for a fast, mess-free process, making them ideal for bulk mailing and frequent correspondence.
•Enhanced Security Envelopes: Made from durable 24 lb / 90 gsm paper, these envelopes provide extra protection for your important documents while maintaining confidentiality.
•Ideal for Bulk Mailings: These #9 self-seal no window envelopes come in bulk packs and are compatible with laser and inkjet printers, making them perfect for high-volume mailing and frequent business correspondence.

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$25.99

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Office Depot

Office Depot All-Purpose Envelopes, #9 (3 7/8in. x 8 7/8in.), White, Box Of 500, 77115

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Perfect for a variety of applications
•All-purpose envelopes are ideal for personal and business correspondence.
•Fully gummed flap promotes a strong, dependable seal.
•Office Depot Brand all-purpose white #9 envelopes are made with crisp 24-lb wove.
•Box of 500 envelopes.

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$17.97

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EnDoc

#9 Envelopes Letter Size - 80 Pack - 3 7/8 x 8 7/8 inch White Business Envelopes with Gummed Seal - Return Mailing Envelopes - Legal Envelopes for Checks, Invoices, Statements - 24lb Plain Envelopes

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Classic Style: Our pure white no. 9 envelopes exude classic elegance, perfect for formal mailing, slimline cards, and invitations. With traditional V-shaped flaps and dual diagonal seams, they're ideal for both home and business use.
•Compact Size: Envelopes #9 compact dimensions - 3 7/8"x8 7/8" or 9.84x20.32 cm. Fit a 3-folded piece of 8 1/2"x11" piece of paper perfectly. They also fit neatly inside #10 envelopes, eliminating the need for folding when sending return envelopes.
•Traditional Gummed Seal: Our #9 business envelopes offer a reliable way to seal the envelope, providing peace of mind that contents will remain intact during transit. This adhesive seal creates a strong bond that helps prevent accidental opening.
•Printer-Friendly Design: The windowless design of our white envelopes letter size provides a printable surface for easier print labeling or hand addressing. This makes them perfect for business mailing or hand addressing for home use.
•Optimal Quantity: 80 pack of #9 mailing envelopes is perfect for regular use without the need for excessive spending on bulk 500 packs. It enables you to try different envelope types and sizes to find the best option for your home & business needs.

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$7.99

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