Best Office Express in 2026

A Quantity of 500 - 9 x 12 Booklet Envelope - 28# White

28# White Wove Paper - Regular Gummed Flap

Great for mailing Invoices, statements, catalogs or announcements.

#10 business letter envelopes for personal or professional use

Includes 500 #10 envelopes made of 24-pound standard white woven paper for quality and strength; no tint

Moisture activated gummed closure ensures a secure seal

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

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

Perfectly fits QuickBooks Laser Checks, or other computer printed checks: checks will slide in easier with a slightly wider design than the standard two window 8 5/8 envelope

Checks amounts and memos will not be visible: Only addresses will show through our unique 2 window design with no need to change QuickBooks, QB Online, or Quicken settings

Provides complete check security: your checks will be hidden with our security tint design

SUPER STRONG CONSTRUCTION – Standard White Envelopes Are Crafted of Heavy, Durable 24lb Paper for Exceptional Rip, Tear & Puncture Resistance

BOOKLET ORIENTATION – Classic Open From side Style Enables Fast, Convenient Stuffing for Letter, Legal Document, Pamphlet, crafts, Coupons, Greeting Card, Christmas Cards, Wedding Invitations, hand made greeting cards, folded letters, CDs, Other Common Mailers

LETTER SIZE PRICING – Ideal 6” x 9” Size Offers Maximum Space Within USPS 1-Stamp Dimension Requirements; Buy Bulk & Save Big on Both Supplies & Shipping

Color: Clear

Size: Letter (9.75 x 1.25 x 13 inches)

Quantity: 12 per pack

500 standard-size security-tinted #9 double window envelopes

Ideal for 8.5-by-11-inch computer-generated invoices and statements

Double windows 3/8-inch from the left to show sender info (2 inches from bottom) and recipient info (1/2 inch from bottom)

10 business letter envelopes with single left address window

Includes 500 10 envelopes made of 24-pound white woven paper for quality and strength

Interior security tint for privacy; securely send checks, invoices, or other confidential documents

Quality Park's 6 x 9 catalog envelopes are perfect for holding folded documents or smaller items. They are great for mailing, storage and organizing in both home and office environments.

Redi-Strip provides a clean, quick seal immediately upon contact. Simply peel off the adhesive strip and press to seal. The peel-off strip protects the adhesive from dust for a longer shelf life

Manufactured from heavyweight 28 lb. white wove stock to give contents extra protection during mailing, storage and handling

Get a box of 100 Columbian 9 x 12 envelopes with SimplySafe tamper-evident pull strips and security tinted interiors for mailing sensitive oversized documents; easy peel off Release & Seal closure

Columbian 9 x 12 envelopes have a patented SimplySafe seal that will show signs of tampering, safeguarding against unauthorized opening

Security envelopes have a strong security tint pattern so you can't see what's inside; ideal for obscuring more sensitive information and protecting critical documents

NO. 6 x 9 BOOKLET ENVELOPE PACK : 6” x 9” size business envelopes are perfect for mailing a variety of big documents including booklets, catalogs, forms, invoices & cards great envelopes for mailing tax returns ideal size for brochures, legal docs, wedding invitations & direct mailers offers maximum space within USPS 1-stamp dimension requirements; buy bulk & save big on both supplies & shipping.

DURABLE 24LB PAPER : These colored business envelopes are crafted from durable 24lb High quality Starburst paper. This makes them economical and durable.

BRIGHT COLOR : These brightly colored envelopes never fail to impress. Attractive and attention-grabbing, these multicolor envelopes are a popular choice for sending marketing mailers.

A Quantity of 500 - 9 x 12 Booklet Envelope - 28# White

28# White Wove Paper - Regular Gummed Flap

Great for mailing Invoices, statements, catalogs or announcements.

9 x 12 BOOKLET ENVELOPE PACK – Business Envelopes Are Perfect for Mailing a Variety of Big Documents Including Booklets, Catalogs, Forms, Invoices & Cards Great envelopes for mailing tax returns

PEEL AND SEAL CONVENIENCE – Easy Close Design Features Durable No Lick Flap with Pre-Moistened Adhesive Strip & Removable Backing; Just Peel, Press & Send

HEAVY 28 LB PAPER STOCK – Prevents Rips, Tears, Weather & Travel Damage While Providing Thick, Durable Surface for Printed Return Address & Other Custom Detail

9 X 12 White Envelope

Booklet / Open Side Style

150 Envelopes per Box

Columbian Envelopes 6" X 9" Catalog envelopes are a safe, secure choice for smaller mailings

28 lb. White wove envelopes provide privacy, protection and durability; The perfect heavyweight stock for everyday business use

Top-loading envelopes make it easy to drop in flyers or other enclosures; ideal for flat rate mailings

Color: Teal Green

Size: Letter (9 1/2 x 1 1/4 x 11 1/2 inches)

Quantity: 12 per pack

VERSATILE MINI ENVELOPE: If you’re looking for an envelope for coin collections, craft supplies, buttons, seeds, invitation inserts, and more, our #1 coin envelopes are a great option. They are designed to fit inside direct mail, letters, and even holiday gift boxes. Use these coin envelopes to hold stamps, party favors, small manufacturing parts/inventory items, business cards, gift cards, and other small items.

MOISTENABLE GLUE SEAL: These moistenable envelopes are perfect for any use. You can even use a moistener to moisten the glue — it’s a huge time-saver! Simply moisten the strip of glue, press, and seal. It couldn't be easier! This type of adhesive is great for, wedding announcement inserts, personal notes, and more.

PRINTABLE & CUSTOMIZABLE: If you want to customize or label your envelopes with zero hassle, you’re in luck! These envelopes are printer-friendly, so you can use your home laser or inkjet printer to address them. They are printable on both digital and offset commercial printers. No need to worry about smudging or jamming because these envelopes are made for compatibility with most printer models.

PERFECTLY SIZED 6X9 BOOKLET ENVELOPES: These booklet envelopes are ideal for mailing a wide range documents and paper materials, including letters,Christmas cards,wedding invitations, direct mail,storing some small items ,catalogs and more.

EASY SEAL ENVELOPES: These 6x9 self sealing envelopes come with easy-to-use peel & seal strips, which delivers hassle-free and moisture-free closure. Just peel off the strip to expose the adhesive on the flaps of these 6 x 9 booklet envelopes. Press down on the flaps to seal the envelopes.

STRONG AND ECONOMICAL: Made from 28 pound paper, these 6x9 self sealing envelopes are much more durable than regular 24 pound business envelopes. They can carry heavier stacks of documents, newsletters, and other marketing materials.

9 x 12 BOOKLET ENVELOPE PACK – Business Envelopes Are Perfect for Mailing a Variety of Big Documents Including Booklets, Catalogs, Forms, Invoices & Cards Great envelopes for mailing tax returns

PEEL AND SEAL CONVENIENCE – Easy Close Design Features Durable No Lick Flap with Pre-Moistened Adhesive Strip & Removable Backing; Just Peel, Press & Send

HEAVY 28 LB PAPER STOCK – Prevents Rips, Tears, Weather & Travel Damage While Providing Thick, Durable Surface for Printed Return Address & Other Custom Detail

120 PACKS KRAFT ENVELOPES - Package contents 120 PCS security catalog envelopes, perfect size 6x9 inches, printable Kraft envelopes allow you print shipping label or other custom label via your laser or inkjet printers, great for household, office, business, legal and more.

HIGH QUALITY MATERIAL - Reject the cheap quality paper! All our Security Catalog Envelopes are made of superior Kraft paper in 2X thicken improvement to offer a top quality, which features exceptional rip, tear and puncture resistance, made to last.

SELF SEAL SECURITY CATALOG ENVELOPES - No glue and water required, no need to lick the envelopes to seal. The envelopes are with self seal design to offer a strong and convenient sealing experience for you, keep the inner documents safe all the time.

NO. 9 x 12 BOOKLET ENVELOPE PACK : 9” x 12” size open side business envelopes are perfect for mailing a variety of big documents including booklets, catalogs, forms, invoices & cards great envelopes for mailing tax returns ideal size for brochures, legal docs, wedding invitations & direct mailers.

DURABLE 24LB PAPER : These colored business envelopes are crafted from durable 24lb High quality Starburst paper. This makes them economical and durable.

BRIGHT COLOR : These brightly colored envelopes never fail to impress. Attractive and attention-grabbing, these multicolor envelopes are a popular choice for sending marketing mailers.

Columbian 6 x 9 Booklet Envelopes are a safe, secure choice for smaller mailings

24 lb. White wove paper provides a crisp professional look; side-seam construction creates a smooth, fold-free back panel for printing

Booklet orientation; these side-loading envelopes make it easy to drop in thick stacks of documents

6x9 Envelopes: Dimension of Eupako small catalog envelopes is 6x9 inches, smooth touching and professional looking, designed with a self seal and pre-folded flap, saving much time when handling multiple mailings.

Set of 250: Package includes 250 pack 6x9 envelopes self seal, meeting the need of home, office and business use. The catalog mailing envelopes are ideal for mailing catalogs, photos, booklets, bulletins, brochures, handmade cards, Christmas cards, wedding invitations and folded sheets of papers.

Self-sealing Flap: The brown catalog envelope is easy to use. Just peeling off the strip and sealing the flap to get an effortless mailing, no need to lick or moisten. Also, the adhesion of flap is quite strong, secure and lasting, keeping contents from falling out when transiting.

Navy Envelope

Size: 9 x 12 inches

Quantity: 50 Envelopes per Pack

Ideal for filing applications

Durable, 28 lb. Brown Kraft with reinforced clasp closure

100 / Box

White Booklet Envelope

Size: 8.75 x 11.5 inches

Made from high qualuity 24lb paper

Size: 7 x 10 Booklet Envelopes / 7 in x 10 in / 7" x 10" / 178mm x 254mm

Quantity: Pack of 50

Color: 24lb. Bright White

6x9 booklet envelopes, latex self seal, are the perfect size for holding half size sheets paper at 5.5” x 8.5”, or a standard 8.5'' x 11'' letter paper folded in half, with a wide opening that saves times when stuffing booklets, catalogs, cards, or brochures inside

Our booklet envelope 6x9 design opens along the long side edge, making them easy to stuff through the open side. Just press and seal to create a strong lasting seal, with no need to worry about your contents failing out during transit even when shipping hefty shipments like half size catalogs or magazines

The dark black security tint lining and permanent seal in our envelopes (6x9 inches) provide complete security your documents are safe from others during transit, making each envelope safe for sensitive documents like tax, legal, and financial documents

SUPER STRONG CONSTRUCTION – Standard White Envelopes Are Crafted of Heavy, Durable 24lb Paper for Exceptional Rip, Tear & Puncture Resistance

BOOKLET ORIENTATION – Classic Open From side Style Enables Fast, Convenient Stuffing for Letter, Legal Document, Pamphlet, crafts, Coupons, Greeting Card, Christmas Cards, Wedding Invitations, hand made greeting cards, folded letters, CDs, Other Common Mailers

LETTER SIZE PRICING – Ideal 6” x 9” Size Offers Maximum Space Within USPS 1-Stamp Dimension Requirements; Buy Bulk & Save Big on Both Supplies & Shipping