Which mailing method can be used for Other Regulated Materials Domestic (ORM-D) packages?

The correct answer indicates that Other Regulated Materials Domestic (ORM-D) packages can be shipped using USPS Retail Ground. This method is appropriate for ORM-D shipments because it accommodates packages that contain non-hazardous materials regulated by the Department of Transportation. USPS Retail Ground offers a cost-effective method for sending these types of parcels, especially for those that are larger or heavier than what is typically allowed for other priority methods.

This choice also aligns with the established regulations regarding ORM-D materials, which are designed to ensure safety during transport without requiring the stricter measures needed for hazardous materials. The other mailing methods, such as Flat Rate Priority Mail, Media Mail, and Priority Mail Express, have specific restrictions and are generally not suited for ORM-D shipments. For instance, Media Mail is specifically intended for books and educational materials and cannot be used for ORM-D, while Flat Rate and Priority options focus more on speed and delivery efficiency, which may not align with the requirements for ORM-D materials.