What is a key reason for using the U.S Postal Service for shipping cremated remains?

Using the U.S. Postal Service for shipping cremated remains is primarily based on the fact that it is the only approved shipping method by the U.S. Postal Service in accordance with federal regulations. Postal regulations allow for the shipment of cremated remains, provided they are packaged properly and labeled correctly. This ensures that the remains are treated with respect and adhere to legal standards during transit. Other carriers may have varying policies on shipping human remains, which is why reliance on the Postal Service is often emphasized.

While other factors such as safety, speed, and cost are important considerations in shipping, they do not hold the same significance as the compliance with legal and regulatory requirements for handling cremated remains.