1st class international package is a service offered by USPS for lightweight parcels traveling internationally. It’s one of the most affordable options for sending packages under 4 lbs to over 180 countries. Though slower than Priority or Express Mail, 1st class international package service includes tracking to select countries and is suitable for small, low-value items. Businesses use it to keep shipping costs down, especially when speed is not critical. Customs forms must be completed, and delivery times vary based on destination. It’s a go-to option for budget-friendly global shipping.