What is the weight limit for first class mail

The weight limit for First Class Mail in the United States is 13 ounces (369 grams). This includes letters, postcards, and flats (large envelopes) that are sent using First Class Mail.

If your item weighs more than 13 ounces, you will need to use a different type of mail service, such as Priority Mail or Parcel Post, which have higher weight limits. Here are the weight limits for some common types of mail services:

It's worth noting that even if your item weighs less than 13 ounces, it may still be subject to additional fees or restrictions if it is oversized, irregularly shaped, or contains hazardous materials. It's always a good idea to check with the USPS or a postal service representative to confirm the weight limit and any other requirements for your specific item.