First Class Postage Rates 2024 Large Envelope. Usps sends mail to over 180 countries, including canada and australia. Postal rates are also calculated by reference to the weight, shape, size and destination of the item you are posting, reflecting the cost of processing and delivering those items.

Postal rates are also calculated by reference to the weight, shape, size and destination of the item you are posting, reflecting the cost of processing and delivering those items. First class mail® prices will increase approximately 7.8%.