Usps Rates 2024 Large Envelope. The baseline postage rate to mail a flat/large envelope has increased from $1.35 to $1.39 in postage, but the price for each additional ounce also stayed the same. The baseline postage rate to mail a flat/large envelope has increased from $1.39 to $1.50 in postage.
There are special size requirements for mailing flats at automation prices and carrier route prices. Shape, weight, and size affect the price for large packages.
Usps Rates 2024 Large Envelope Images References :