Which of the following is true regarding overpacking?

Overpacking is a crucial procedure in hazardous materials handling that involves placing smaller containers of hazardous materials into larger drums or containers to ensure safe storage and transport. The statement regarding overpack drums needing to be marked is accurate because proper labeling is essential for identifying the contents and ensuring that they are handled safely during storage and transportation. This marking includes important details such as the type of hazardous materials contained within the overpack, precautionary measures, and handling instructions.

Labeling is a regulatory requirement as it helps emergency responders and handlers easily recognize the nature of the materials they are working with, thereby reducing risks associated with mishandling. Marking overpack drums also aids in compliance with regulations set forth by entities such as the Department of Transportation (DOT) and the Occupational Safety and Health Administration (OSHA).

In contrast, unmarked overpack drums could pose significant safety risks and regulatory violations, while the notion that overpacking is only applicable to liquids is inaccurate, as it can also apply to solids and gases contained within smaller primary containers. Additionally, overpacking is a legal and often necessary practice to enhance safety, rather than being an illegal activity.