Average mail envelope size

The average size of a mail envelope can vary depending on the type of mail and the country's postal regulations. However, here are some general guidelines on the average size of a mail envelope:

In the United States, the United States Postal Service (USPS) has specific guidelines for envelope sizes:

In Canada, the Canada Post has similar guidelines:

It's worth noting that these are general guidelines, and the actual size of a mail envelope may vary depending on the specific type of mail and the country's postal regulations.