Top 10 Best 6 3 4 security envelopes self seal in 2026

Last Updated - 6/18/2026

🏆Best Choice

Aimoh

Aimoh #10 Security Self Seal Envelopes – 100 Qty |No Window, EnveGuard, 4⅛ x 9½", White, 24 LB, 100 Count (34100)

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•✉️ 100 ENVELOPE PACK; these envelopes are manufactured with a WINDOW-LESS front panel for the perfect choice for small businesses, home offices and everyday use, #10 Security Envelopes are provided in a 100-envelope pack
•✉️ SUPER SECURITY TINT PATTERN; #10 envelopes designed with a secure, security tint-pattern to protect contents and sensitive information, perfect for ultra-secure mailing
•✉️ 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 for any letter sized and larger documents without splitting
•✉️ LASER AND INKJET PRINTER COMPATIBLE; premium construction measuring 4-1/8 x 9-1/2 inches, fully compatible with most inkjet and laser printers for quick and easy addressing! Click the Orange Button to order now

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$9.99

$12.78

-22%

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Joyberg

Joyberg 6x9 Envelopes Self Seal, Yellow, Printable, Tear Resistant Kraft Envelopes for Mailing Letters, Documents, Photos, Invitations

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•48 PACKS ENVELOPES 6x9: you will receive 48 6x9 inch 6x9 envelopes self seal that we have prepared for you. enough quantity for your use and needs, perfect 6 x 9 envelopes for use at home, office, school, and more.
•HIGH-QUALITY KRAFT PAPER: Our catalog mailing envelopes 6x9 are made of 105gsm high-quality yellow kraft paper, which is sturdy, durable, and tear-resistant, and can better ensure that the items will not be damaged in the process of mailing and transportation to ensure the integrity of the items.
•STRONG SEALING ADHESIVE: These 6x9 envelopes self seal come with their strong sealing adhesive, no need to prepare separate glue. To use, simply peel off the white lining, fold, and press for a few seconds to seal the envelope, keeping your mailings safe and long-lasting in a completely airtight environment, and the super-sticky nature of the sealing adhesive ensures that items won't fall out of the envelopes during transportation.
•PROTECT PRIVACY & FREE PRINTING: 6x9 envelopes self seal is completely opaque, no matter if you put any items in the envelope, you can't see the content inside at all without opening it. High-quality yellow envelopes 6x9 have a blank surface, no matter laser/inkjet printing or DIY envelopes, there will be no ink bleed or blurred handwriting phenomenon, please feel free to use them.
•WIDE APPLICATION: yellow kraft envelopes can be used in many times, customize your envelopes by printing patterns and text, you can use it to mail documents, letters, invitations, photos, and so on, and it's also a good choice to store documents in daily life.

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$6.99

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Amazon Basics

Amazon Basics Quality #6 3/4 Security-Tinted Envelopes with Peel and Seal, 300-Pack, White

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•300-Pack of #6 envelopes with Peel & Seal closure―no moisture needed
•Ideal for home or office; securely send checks, invoices, or other confidential documents
•Interior security tint keeps content private
•24-pound white woven paper for quality and strength
•Measures 3-5/8 by 6-1/2 inches each

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$11.34

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Splendoress

#10 Envelopes Letter Size Self Seal | 500 Business Mailing Security Peel and Sealing Envelope | 100% Tinted | no 10 White Windowless Legal Regular Plain Envelops Pack | 4-1/8 x 9-1/2 Inches | 24 LB

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•HIGH QUALITY & BULK PRICING - 24lbs high quality envelopes at a fraction of the price
•NO NEED TO LICK THE FLAP ANYMORE - Very convenient
•SELF SEAL ENVELOPE- Just peel and stick 4 1/8 in. x 9 1/2 in size envelop
•CAN'T SEE THROUGH ENVELOPES - Security printing pattern on the inside prevents from seeing what inside. Windowless envelope
•LONG LASTING SUPPLY - 500 count per box
•NDAA Section 889 Compliance Certfication

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$26.95

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KKBESTPACK

Kkbestpack Kraft Paper Bubble Mailers #0, Self-Seal Padded Mailing Envelopes, Pack of 25, 6x9 Inches

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•Size & Capacity – Exterior dimensions: 6x10 inches; usable interior space: 6x9 inches
•Self-Sealing Closure – Adhesive strip allows easy and secure envelope sealing.
•Versatile Use – Suitable for mailing small items such as phone cases, cards, jewelry, and accessories
•Lightweight Construction – Designed for convenient handling and shipping efficiency.

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$11.45

$12.95

-12%

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Mead

Mead #6-3/4 Envelopes, 3-5/8" x 6-1/2", Security Printed Lining for Privacy, Press-It Seal-It Self Adhesive Closure, White All-Purpose 20-lb Paper Mailing Envelopes, 500 Count (742021)

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•STANDARD SIZE – Easily send everyday mail. These #6-3/4 size envelopes measure 3-5/8" x 6-1/2" and 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 500 envelopes. Made with SFI certified sourcing.

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$18.80

$24.99

-25%

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Quality Park

Quality Park #6 3/4 Self-Seal Security Envelopes, Security Tint and Pattern, Redi-Strip Closure, 24-lb White Wove, 3-5/8 x 6-1/2, 100/Box (QUA10417)

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•SAVE TIME WITH SELF-STICK: Quality Park 6 3/4 Security Envelopes have a strong peel & stick closure that helps you fly through mailings in record time
•ENHANCED SECURITY: Offer the protection clients deserve & protect yourself from liability; a security tint makes envelopes hard to see through; a security pattern scrambles the appearance of text
•LESS YUCK: We promise you won't miss licking envelopes or crumbly, drippy sponges; complete your mailings, no accessories required
•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 3-5/8 x 6-1/2 inch envelopes

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$7.96

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METRONIC

METRONIC #6 Envelopes Security Self Seal, 100 Count Small Envelopes, Envelope Letter Size 3⅝ x 6½", White No Window Mailing Envelopes

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•[Standard #6 Size Fit] Sized 3⅝ x 6½", perfect for organizing receipts or sending sobres para cartas.
•[Self-Sealing Convenience] Save time with no-lick adhesive. Perfect for busy offices or home use, the envelopes self seal instantly for fast, clean mailing.
•[Security Tint Design] Keep contents private with strong security envelopes. Ideal for mailing checks, signatures, and cash with confidence.
•[Multipurpose Use] Designed for checks, letters, bills & more. These small envelopes 4x6 are perfect for organizing receipts or sending sobres para cartas.
•[Great Value Pack] Bulk pack offers excellent value for money—ideal for small businesses and households alike.

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$8.29

$9.99

-17%

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BAZIC Products

BAZIC Security Self Seal Envelope 3 5/8" x 6 1/2" #6, No Window Tint Pattern Mailing Envelopes, Peel & Seal (80/Pack), 1-Pack

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•⭐ #6-3/4 SECURITY ENVELOPES. These 3 5/8" x 6 1/2" inch envelopes are designed with security print to protect contents and sensitive information, perfect for protecting sensitive information from others.
•⭐ SECURE. Just peel and seal to create a strong lasting seal without licking or moistening. Our self seal design is quick and easy and is guaranteed to stay sealed with no need for tape or glue sticks.
•⭐ WINDOWLESS DESIGN. Envelopes manufactured with a windowless front panel for easy printing, labeling or hand-addressing, perfect for quick, mass business mailings.
•⭐ WHITE 20LB STOCK. Perfect for everyday business use, these standard white envelopes are crafted of heavy, durable 20lb paper and securely holds hefty files during transit.
•⭐ MULTI-PURPOSE. These envelopes can easily fit invoices, letters, checks, gift cards, etc. These envelopes can be used for virtually anything you need them for!

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$6.38

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Mead

Mead Press-it Seal-it Business Envelope, 3 5/8 _ 6 1/2, 20 lb, White, 65/Box

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Envelope_Size - 3 5/8 6 1/2
•Envelope/mailer_Type - Business/Trade
•Closure - Self-Adhesive
•Trade_Size - 6 3/4

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$5.49

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