What is the maximum weight limit for a 1st class letter?

The maximum weight limit for a 1st class letter is 13 ounces. This weight limit is critical for ensuring that the mailing process remains efficient and cost-effective while still meeting the needs of customers.

When a letter exceeds this weight, it is no longer classified as a 1st class letter and must be sent using a different mailing service. This distinction is important for both postal services and customers because it affects the pricing, delivery speed, and handling of the mail. Understanding these weight limits allows postal clerks to assist customers accurately and ensure that items are eligible for their intended mailing service.

The answer of 13 ounces is in line with USPS regulations, which have been established to simplify mailing and ensure that it can be managed within the operational capabilities of the postal service.