What is the maximum weight allowed for 1st class mail?

The maximum weight allowed for First-Class Mail is 13 ounces. This is an important regulation set by the USPS that differentiates First-Class Mail from other classes of mail in terms of weight limits. First-Class Mail is intended for letters, postcards, and lightweight parcels, providing a reliable service for items weighing up to 13 ounces.

This weight limit applies to a variety of mail types under the First-Class category, ensuring that items can be sent quickly and efficiently while still falling within the criteria for this service. Items over 13 ounces typically would need to be sent using a different mailing option, such as Priority Mail, which expands the allowable weight significantly, but is not part of the First-Class Mail services.

Understanding this weight limit is crucial for anyone working in the postal system, as sending items over this limit without proper labeling or postage can lead to issues with delivery and may incur additional charges or delays.