us postal service first class international is a cost-effective option for sending mail and packages from the United States to international destinations. USPS First-Class International Mail is an affordable way to ship lightweight items, with rates that are often lower than other international carriers. Delivery times can vary depending on the destination, but it typically takes anywhere from 7 to 21 business days for most countries. While this service is slower than expedited options, it provides a reliable and affordable way for individuals and businesses to send international mail. By using USPS First-Class International, customers can save on shipping costs while still ensuring their items reach their international destinations.