Us first class mail weight limit

The weight limit for First-Class Mail in the United States is 13 ounces (369 grams). This means that any letter or package weighing more than 13 ounces cannot be sent via First-Class Mail and must be sent via a different class of mail, such as Priority Mail or Parcel Post.

Here are some additional details about the weight limit for First-Class Mail:

It's worth noting that the weight limit for First-Class Mail does not apply to packages that are sent via Priority Mail, which has a higher weight limit of 70 pounds (31.8 kilograms).