What is the maximum weight for First Class Mail?

The maximum weight for First-Class Mail is 13 ounces. This weight limit applies to letters and small parcels, ensuring that First-Class Mail remains an option for light packages and correspondence. Under this limitation, items can be sent with relatively fast delivery times and reliable service, which is one of the key features that make First-Class Mail popular for personal and business communication alike.

Items weighing over 13 ounces must be sent using another service, such as Priority Mail or other appropriate mail services. This distinction helps to manage the flow of mail and ensure efficient delivery systems, while also providing options for heavier packages through alternative USPS services.