What is the maximum weight for a letter-size mailpiece?

The maximum weight for a letter-size mailpiece is indeed 3.5 ounces. This weight limit is crucial for maintaining the classification and pricing structure set by postal services, as letters are often subject to different rates and guidelines compared to larger or heavier mailpieces such as flats or packages.

Understanding this limit allows senders to properly classify their mail and choose the correct postage, ensuring that their items are processed efficiently and delivered without delay. Additionally, staying within this weight range ensures adherence to postal regulations regarding size and weight, which helps avoid potential surcharges or return of the mail due to improper classification.

Knowing that the other options exceed the weight limit for a letter can help in identifying the characteristics of letter-size mailpieces and aid senders in making informed decisions when preparing their mail.