What is the maximum weight for a letter sent through USPS?

The maximum weight for a letter sent through USPS is accurately represented in the context of standard first-class letters. Letters must adhere to specific weight limits to qualify for mailing at letter rates, with the maximum weight being 3.5 ounces. This limit ensures that the mail is processed efficiently and can be handled within the mechanized systems used by USPS.

If a letter exceeds 3.5 ounces, it must be classified differently, such as a flat or a parcel, which generally incurs higher postage rates. Understanding these weight limitations is crucial for anyone involved in mailing processes as it affects both the choice of mailing service and the cost incurred.