Can media mail include an invoice

According to the United States Postal Service (USPS), Media Mail is a type of mail service that allows for the mailing of books, sound recordings, and other educational materials at a discounted rate. However, there are some specific rules and restrictions that apply to Media Mail, including:

• Media Mail cannot be used for commercial purposes, such as shipping merchandise or invoices.
• Media Mail packages must be marked with the correct postage and a "Media Mail" endorsement on the outside of the package.
• Media Mail packages are subject to inspection by the USPS to ensure compliance with these rules.

Unfortunately, this means that you cannot include an invoice with a Media Mail package. The USPS considers an invoice to be a commercial document, and including one with a Media Mail package would violate the rules of the service.

If you need to send an invoice to a customer, you will need to use a different type of mail service, such as First-Class Mail or Priority Mail. These services allow for the inclusion of commercial documents, including invoices.

It's worth noting that there are some exceptions to these rules, such as when shipping educational materials to students or teachers. In these cases, you may be able to include an invoice with your Media Mail package. However, it's always best to check with the USPS or a postal service representative to confirm the specific rules and regulations that apply to your situation.