Heads Up: No Pieces Can Contain Advertising
If you wish to send your package via Media Mail, you CANNOT include any advertising inside. This is an extremely important point. If USPS finds advertising of any kind inside your package, it will be disqualified for Media Mail and you’ll end up paying way more money for “postage due” with another service like Priority Mail. That would defeat the whole purpose of trying to save money by sending your parcel via USPS Media Mail in the first place.