Which of the following is true about First-Class Mail International?

First-Class Mail International is designed to provide an efficient and cost-effective way to send both letters and packages to destinations outside of the United States. One of its key features is that it permits packages up to a specific weight limit, which allows users to send items that are not just confined to documents. This makes it a versatile option for sending various types of items internationally, addressing the needs of customers who wish to ship goods rather than just correspondence.

In contrast, the statement regarding documents only is misleading because First-Class Mail International isn't limited to documents; it can include packages. Additionally, it is inaccurate to classify it as the slowest mail service, as other international services may take longer depending on the destination and service timeframe. Although tracking may be included in some international services, First-Class Mail International does not inherently offer tracking for every shipment, which differentiates it from more premium services. So, the allowance for packages—up to the designated weight limit—accurately reflects the service's purpose and capability.