What is an overpack in the context of hazardous material packaging?

An overpack, in the context of hazardous material packaging, refers to an enclosure used by a single consignor to consolidate multiple packages in one shipment. This is an important practice in the transportation of hazardous materials as it provides an additional layer of protection and can help to ensure compliance with safety regulations. The use of an overpack allows for easier handling and protects the individual packages from damage during transportation.

This definition is crucial because it addresses the regulatory requirements for safely shipping hazardous materials. When multiple smaller packages that may each pose a risk are combined into one overpack, it simplifies monitoring and managing potential hazards. Additionally, it ensures that if any one package leaks or causes an issue, the overpack can contain that risk.

The other options do not accurately represent the concept of an overpack. For instance, an individual package containing hazardous materials (the first option) does not involve the consolidation of multiple items; a type of bulk packaging (third option) typically refers to large containers that hold contents without intermediate packaging; and a combination of different materials (fourth option) is too vague and does not specifically relate to the function of an overpack in hazardous material contexts.