What are the different mailing classes available for domestic mail?

The United States Postal Service offers several different mailing classes for domestic mail, each designed to meet specific needs and budgets. The most common mailing classes include First-Class Mail, Priority Mail, and Priority Mail Express, among others. First-Class Mail is typically used for personal correspondence, bills, and small parcels. It provides swift delivery, usually within one to three business days, and includes features such as tracking and delivery updates for certain services. Priority Mail is a step up from First-Class Mail, offering faster delivery, usually within one to three business days as well. It is ideal for packages weighing up to 70 pounds and includes free tracking and delivery updates. Priority Mail also provides the option for flat-rate boxes, which can simplify shipping costs. Priority Mail Express is the fastest domestic mailing class, delivering packages overnight to most U.S. locations. This option includes guarantees and tracking, ensuring that customers receive their packages with a high level of reliability. Additionally, the USPS offers other classes such as Media Mail, which is a cost-effective option for shipping educational materials and books, as well as Retail Ground for larger parcels without time-sensitive needs. Each class has its own specific features, delivery times, and costs. For the most accurate and up-to-date information, it may be helpful to review the current web page of the United States Postal Service.