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Can You Mail Clasp Envelopes? - Everything you need to know

When it comes to mailing important documents, using the right kind of envelope is crucial. Clasp envelopes are a popular choice for sending sensitive documents as they offer added security with their metal clasp and reinforced edges.

However, many people are unsure if they can actually mail clasp envelopes; the answer is yes, you can mail clasp envelopes.

However, there are some things you need to keep in mind to ensure that your mail arrives at its destination safely and on time.

In this article, we'll take a closer look at clasp envelopes, how to prepare them for mailing, and what you should keep in mind when sending them through the postal service.


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So can You Mail Clasp Envelopes?

As we mentioned earlier, you can mail clasp envelopes. They are a common choice for sending important documents such as contracts, legal papers, and confidential letters. 

The United States Postal Service (USPS) allows the use of clasp envelopes for mailing as long as they meet certain requirements.


What are the USPS Requirements for Mailing Clasp Envelopes?

The USPS has specific requirements for mailing clasp envelopes. These include:

  • The clasp must be fully fastened, and the envelope must be securely sealed.
  • The envelope must be rectangular and not exceed the maximum size of 12 inches in length, 15 inches in width, and 3/4 inches in thickness.
  • The envelope must not weigh more than 13 ounces.
  • The envelope must be made of paper or cardboard.
  • The envelope must be free of any extraneous markings or labels that may interfere with processing and delivery.

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 How to Mail Clasp Envelopes

When preparing a clasp envelope for mailing, there are a few key steps you should follow:

  1. Seal the envelope: Before you do anything else, make sure that the envelope is properly sealed. You can use the metal clasp to keep the envelope closed, but you should also use tape or glue to ensure that the contents do not fall out during transit.
  2. Address the envelope: Write the recipient's name and address clearly on the front of the envelope using a pen or marker. Ensure the address is legible and accurate to avoid delays or lost mail.
  3. Add postage: Calculate the appropriate amount of postage for your envelope based on its weight and size. You can use a postage scale or consult with a postal worker to determine the correct postage amount.
  4. Drop it off: Once your envelope is properly prepared, you can drop it off at your local post office or mailbox. If you are sending time-sensitive or important documents, you may want to consider using a certified or registered mail service for added security.


The Advantages of Mailing Clasp Envelopes

There are several advantages to using clasp envelopes for mailing. These include:

  • Added security: The metal clasp closure ensures that the contents of the envelope are securely fastened, providing added protection during transit.
  • Reusability: Clasp envelopes can be reused several times, making them an eco-friendly option.
  • Versatility: Clasp envelopes are available in a range of sizes and colors, making them suitable for mailing a variety of items.

Click here for more information on what is a clasp envelope


What to Keep in Mind

While clasp envelopes are a great choice for sending important documents, you should keep a few things in mind to ensure that your mail arrives at its destination safely and on time.

  1. Size and weight: Make sure that your envelope is within the size and weight limits set by the postal service. Oversized or overweight envelopes may require additional postage or may not be accepted for mailing. Click here for more information on clasp envelope sizes
  2. Fragile items: If you are sending fragile items, such as photographs or CDs, you should consider using a padded envelope or a box to ensure that they do not get damaged during transit.
  3. Customs forms: If you are mailing items internationally, you may need to fill out customs forms and pay additional fees. Make sure you research the destination country's requirements before sending your mail.
  4. Tracking and insurance: If you send valuable or time-sensitive items, you may consider using a tracking or insurance service to ensure your mail arrives safely and on time.


Frequently Asked Questions

  • Q Can I use a clasp envelope for international mailing?
  • A Yes, clasp envelopes can be used for international mailing, but you should check with the postal service in the destination country for any specific requirements.


  • Q Can I use a clasp envelope for mailing heavy items?
  • A No, clasp envelopes are not suitable for mailing heavy items as they have weight limitations.


  • Q Do I need extra postage for a clasp envelope?
  • A Possibly, depending on the weight and size of the envelope. Check with your postal service for any specific requirements.



In summary, you can definitely mail clasp envelopes as long as you follow the proper preparation and mailing guidelines. Always make sure that your envelope is properly sealed, addressed, and has the appropriate amount of postage. Additionally, keep in mind any size and weight restrictions, as well as the destination country's customs requirements. By following these tips, you can ensure that your mail arrives safely and on time.