What feature distinguishes First Class Mail?

The distinguishing feature of First Class Mail is its ability to include services such as insurance and same day delivery. First Class Mail is a premium mailing service offered by the USPS that is designed to be fast and reliable. It not only allows for the delivery of letters and postcards but also enables customers to mail packages weighing up to 13 ounces.

Additionally, First Class Mail comes with options for added services, including insurance for valuable items and expedited delivery. This flexibility makes it a popular choice for both personal and business correspondence, as it offers more comprehensive features compared to other mail classes, such as Standard Mail or Marketing Mail.

While the other options mention certain restrictions or requirements, they do not accurately describe the features inherent to First Class Mail. For instance, it can be sent any day the post office is open, includes a broader range of mailing options beyond just letters and postcards, and does not necessitate a printed invoice. Thus, recognizing the inclusion of services like insurance and same day delivery truly underscores what sets First Class Mail apart.