Top 10 Letter Size Envelopes 9×12 – Clasp Mailing Envelopes

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1. Quality Park

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Quality Park Gummed Kraft Clasp Envelopes, 100 / Box, 28 lb, #90-9" Width x 12" Length, Kraft, Gummed, Clasp, Kraft

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Quality Park #ad - Envelopes are made of sturdy, 28 lb Kraft Stock. Rugged envelopes feature a reinforced clasp design plus deep gumming on flaps for a secure seal.
BrandQuality Park #ad
ManufacturerQuality Park #ad
Height3.75 Inches
Length14 Inches
Weight4 Pounds
Width9.1 Inches
Part NumberQUA37890
Model37890

2. Amazon Basics

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

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Amazon Basics #ad - Durable 28-pound white woven paper for quality and strength. 100-pack of no. 10-1/2 catalog envelopes. Measures 9 by 12 inches each. Ideal for mailing catalogs, booklets, brochures, and multi-page documents. Easy-to-seal peel and Seal closure—no moisture needed.
BrandAmazon Basics #ad
ManufacturerAmazon Basics #ad
Part NumberAMZP15
ModelAMZP15

3. Aimoh

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9 x 12 inch 38100, 100 9 x 12 SELF Seal Security White Catalog Envelopes, Security Tinted, Ultra Strong Quick-Seal, 28lb

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Aimoh #ad - 100 9 x 12 catalog envelopes in every pack for a long lasting supply, easy bulk mailing and everyday business correspondence!9x12 catalog envelopes; aimoh’s white 9x12 security envelopes combine a professional security tint pattern, large size for business documents and premium quality for the best 9x12 envelopes on the market.

Security tint pattern; ideal for secure business mailing and sensitive correspondence, security tint pattern to protect contents, each 9x12 envelope contains a super secure, information and data when mailing. For 8. 5x11 documents; large 9x12 size and strong quick-seal closure security tinted envelopes, thicker, catalogs, perfect for photos, larger documents and other business mailings.

White 28lb stock; perfect for everyday business use, aimoh’s 9x12 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 and use high quality, white 28lb stock for a professional finish.
BrandAimoh #ad
ManufacturerAimoh #ad
Height2.5 Inches
Length9 Inches
Weight4.06 Pounds
Width12 Inches
Part NumberFBA_38100
ModelFBA_38100

4. Mead

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Mead Clasp Envelopes, Brown Kraft, 20 per Box 76020, 9" x 12", Office Pak

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Mead #ad - Heavyweight envelopes feature a clasp closure, in an Office Pak for larger quantity. 20 envelopes per box. Brown Kraft material. 9" x 12" size. Made in United States.
BrandMead #ad
ManufacturerACCO Brands #ad
Height14.45 Inches
Length0.88 Inches
Weight0.65 Pounds
Width9 Inches
Part Number76020
Model76020
Warrantykkk

5. Blue Summit Supplies

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100 9 X 12 Self Seal Security Catalog Envelopes, Designed for Secure Mailing, Securely Holds up to 60 Sheets of Paper with Strong Peel and Seal Flap 100 Envelopes

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Blue Summit Supplies #ad - Perfect size for standard 8. 5'' x 11'' letter paper, wide opening saves times when stuffing up to 60 sheets of letter paper securely. Just peel and seal to create a strong lasting seal: No need to worry about your contents failing out during transit even when shipping hefty shipments like 60 sheets of paper or magazines.

Safe for sensitive documents like tax, legal, and financial documents. Great for storing receipts, tax returns, monthly financials, magazines, reports and more. Securely holds hefty files during transit due to it sturdy construction and thick 28 LB White Wove Paper. Provides complete security: your documents are safe from others during transit. Allows for organized storage of personal and company documents due to its large size and Security Tint.
BrandBlue Summit Supplies #ad
ManufacturerBlue Summit Supplies #ad
Weight3.97 Pounds
Part NumberBSS-92588-010

6. EnDoc

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15 Pack, White 28lb Heavyweight Paper, Business, Mailing Documents, Office, or School., For Home, Legal, EnDoc 9x12 Open End Self Seal Envelopes

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EnDoc #ad - Heavyweight envelope set – pack of 15 single envelopes accommodates Variety of Small & Large Documents for Home, Business, Office, Legal & More.

Thank you for supporting American manufacturing! Made in the usa - proudly made right here in the United States. Catalog envelopes - Are perfect for catalogs, brochures, and leaflets. Peel off the protective strip and press the flap firmly to create a tight bond that seals the contents safely inside the envelope. Self sealing closure - makes securing contents quick and easy. Super strong construction – standard white envelopes are crafted of Heavy, Durable 28lb Paper for Exceptional Rip, Tear & Puncture Resistance.
BrandEnDoc #ad
ManufacturerEnDoc #ad
Part Number10x1315
Model10x1315

7. Envelopes.com

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Catalog, 50 Pack White, Magazine, Pamphlet, 9 x 12 Booklet Envelopes in 28 lb. Bright White for Mailing a Business Letter, Financial Document

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Envelopes.com #ad - Durable & reliable: made from heavyweight lux paper stock with a sturdy construction, making them perfect for things like letters, these envelopes are thick and durable, or catalogs. Text-weight paper stock, we offer these envelopes in a variety of other color options as well.

Booklet envelope: these large envelopes are the professional way to ship flat but bulky materials, annual reports, folders, booklets, catalogs, including pamphlets, magazines, brochures, sales literature, and more. Moistenable glue seal: these envelopes are designed with a traditional moistenable adhesive sealing method, use the moistening method of your choice. They are printable on both digital and offset commercial printers. The rectangular flap is on the long side for easier filling.

Our 9” x 12” envelopes are adaptable to a variety of professional situations. Made from 28 lb. Simply moisten the strip of adhesive, apply pressure, making them an excellent option for quick and easy projects. Classic color: if you want a high-quality envelope, these envelopes are thicker and more durable than printer paper and will protect whatever is inside. To seal, and you’ll have the perfect seal. It couldn’t be easier!
BrandEnvelopes.com #ad
ManufacturerEnvelopes.com #ad
Height12 Inches
Length0 Inches
Weight1.1 Pounds
Width9 Inches
Part Number12328-50
Model51495

8. Ampad

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100 Per Box 73127, Tear-Away Quick-Open Strip, Ampad Fastrip Security Catalog Envelope, Security Tint, 9 Inch x 12 Inch, White, Peel & Seal Adhesive

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Ampad #ad - Large & roomy: the 9 x 12 size allows you to send documents without folding; a little room to spare accommodates luggage tags or other trinkets. Sturdy & secure: the strong adhesive will keep your mailing protected; an opaque security tint obscures sensitive correspondence or private data.

Peel & seal convenience: you'll never lick or moisten envelopes again once you've realized the time savings from Fastrip envelopes; pull the tape and let the sticky adhesive strip do all the work. An excellent value: get 100 9 x 12 envelopes at a stock-up price that lets you plan ahead for home or office. Just pull to open: your recipients can open mailings as quickly as you sent them, with one convenient tug; perfect for mailings to seniors, or others with limited hand dexterity.
BrandAmpad #ad
ManufacturerAMPAD/DIVI OF AMERICAN PD & PPR #ad
Height3 Inches
Length12.2 Inches
Weight4.07 Pounds
Width9.8 Inches
Part Number73127
ModelTOP73127

9. EnDoc

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Office, Business, Legal or School Pack- 9 x 12 Inch 15 Pack, Clasp Envelopes, 9x12 – Brown Kraft Catalog Envelopes with Clasp Closure & Gummed Seal – 28lb Heavyweight Paper Envelopes for Home

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EnDoc #ad - Safe for storage – ideal 9 by 12 size is perfect for both mailing & More; Buy in Bulk & storing Important Paperwork, Craft Projects, Stamps, Dies & Save Big. Double seal design – offers reliable security for personal & Professional Mailing; Sturdy Metal Dual Prong Clasps & Gummed Seals w/ Tough Adhesive Glue.

Catalog orientation – classic open end style enables fast, Coupon, convenient Stuffing for Legal Letter, Pamphlet, Magazine & Other Common Mailers. 9x12 clasp envelope set – pack of 15 single reusable envelopes serves a Variety of Small & Large Documents for Home, Office, Business, Legal & School. Made in usa, heavy duty paper – extra strong, durable 28lb standard brown kraft envelopes proudly made right here in the United States Provides Confidential Protection & Exceptional Rip, Tear & Puncture Resistance - Thank you for supporting American manufacturing!.
BrandEnDoc #ad
ManufacturerEnDoc #ad
Part Numberclasp15
Modelclasp15

10. Blue Summit Supplies

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100 9 X 12 Self Seal Golden Brown Kraft Catalog Envelopes, Oversize Strong Peel and Seal Flap with 28 Pound Kraft Paper- 100 Envelopes, Designed for Secure Mailing

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Blue Summit Supplies #ad - Securely holds hefty files during transit due to it sturdy construction and thick 28 LB Kraft Paper. Just peel and seal to create a strong lasting seal: No need to worry about your contents failing out during transit even when shipping hefty shipments like 60 sheets of paper or magazines.

Great for storing receipts, tax returns, magazines, monthly financials, reports and more. Safe for sensitive documents like tax, legal, and financial documents. Perfect size for standard 8. 5’’ x 11’’ letter paper, wide opening saves times when stuffing up to 60 sheets of letter paper securely. Provides complete security: your documents are safe from others during transit. Allows for organized storage of personal and company documents due to its large size.
BrandBlue Summit Supplies #ad
ManufacturerBlue Summit Supplies #ad
Part NumberBSS-92588-014