Largest mailing envelope

The largest mailing envelope that can be used for standard mail in the United States is typically considered to be the "Large Flat Rate Envelope" offered by the United States Postal Service (USPS). This envelope measures 12 inches long, 15 inches wide, and 3/4 inch thick, and has a maximum weight limit of 70 ounces (4.4 pounds).

Here are some key specifications for the Large Flat Rate Envelope:

• Dimensions: 12 inches long, 15 inches wide, 3/4 inch thick
• Maximum weight: 70 ounces (4.4 pounds)
• Maximum size: 12 inches long, 15 inches wide, 3/4 inch thick
• Material: Kraft paper or polypropylene
• Closure: Self-adhesive flap
• Mailing requirements: Must be addressed and affixed with postage

The Large Flat Rate Envelope is a popular choice for sending large or bulky items, such as:

• Documents and papers
• Photos and artwork
• Small gifts and packages
• Catalogs and brochures

Keep in mind that the USPS has specific guidelines for mailing large or irregularly shaped items, so it's always a good idea to check with your local post office or the USPS website for more information before sending a large envelope.

It's also worth noting that there are other types of large envelopes available, such as the "Large Envelope" or "Extra Large Envelope", which may have slightly different dimensions and weight limits. However, the Large Flat Rate Envelope is generally the largest and most cost-effective option for standard mail.