first class international mail usps

first class international mail usps is a service offered by the United States Postal Service that allows individuals and businesses to send packages and letters to international destinations at an affordable rate. First-Class International Mail is one of the least expensive international shipping options available, though delivery times can vary by destination. This service is ideal for smaller, lighter items such as letters, postcards, and documents, with weight limits typically up to 4 pounds for parcels.