10 x 13 Open End Catalog Envelopes with Clasp Closure - Smooth Black

Our review of these 10 x 13 catalog envelopes finds them best suited for anyone who needs a professional, no-fold mailing solution with a distinctive look. The pack of 50 smooth black envelopes combines a clean, jet black finish with a practical open-end design and dual closure options, so it is a sensible choice for small businesses, designers, or office managers who send documents without folding. The biggest reason to buy is the combination of size and presentation: you can ship full-size sheets and forms with a sleek exterior that helps materials stand out in a stack.

Key Features

• Size 10 x 13 in: Allows you to mail standard and slightly larger sheets without folding, preserving presentation and readability.
• Smooth 28 lb paper: Gives a refined surface and reasonable opacity for a professional mailed package or filing use.
• Open-end design: Makes inserting and removing documents easier than side-entry envelopes, speeding up batch packing.
• Gummed flap plus metal clasp: Offers two closure methods so users can choose quick resealability with the clasp or extra security with the gum flap.
• Jet black color: Provides a distinctive, professional look that helps promotional materials and important documents stand out.

Who It's For

These envelopes are ideal for small businesses, creatives, and office teams who need to send or organize full-size documents, portfolios, or promotional packets without folding. The black finish is particularly useful for marketing materials, photo proofs, or anytime presentation matters.

They are less well suited to heavy-duty mailing where rigid protection is required or where very thick paper stock is preferred; some users report the paper feels thin and the metal clasps may loosen if the envelope is bent frequently, so those needing rugged long-term storage should look at heavier mailers.

Pros & Cons

Pros

• Attractive jet black finish that elevates mailed materials and marketing pieces.
• Convenient 10 x 13 in size that fits full sheets and larger documents without folding.
• Dual closure options give flexibility: quick clasp access or reinforced gum seal for added security.
• Pack quantity of 50 is practical for small office runs or event mailings.

Cons

• Paper is 28 lb and some customers find it on the thinner side for repeated handling.
• Occasional reports of metal clasps loosening or tearing when the envelope is bent.

Specifications

Brand	JAM Paper
Color	Black
Size	10 x 13 in
Quantity	50 envelopes per pack
Paper weight	Smooth 28 lb paper
Closure	Gummed flap and folding metal clasp

Our Verdict

For anyone who needs to send full-size documents with a professional look, these 10 x 13 black clasp envelopes offer good value: the size and presentation are the primary strengths, and the dual closure adds useful flexibility. They are a smart pick for presentations, promotional mailings, and routine office filing, though those needing very heavy-duty protection should consider stiffer mailers.

Frequently Asked Questions

Are these envelopes suitable for mailing standard letters?
Yes; the 10 x 13 in size accommodates standard 8.5 x 11 in sheets without folding, which is useful for forms and larger documents.

Do the envelopes close securely for mailing?
They include both a gummed flap and a folding metal clasp, so users can choose a quick clasp or a more secure gum seal depending on their needs.

Is the paper thick enough for repeated handling?
The envelopes are smooth 28 lb paper; many find the finish and opacity good for presentation, but some report the stock feels thin for heavy repeated handling.