What does the term "triple packing" refer to?

The term "triple packing" specifically refers to a three-layer packaging method designed to secure the contents of a package. This approach is essential in the transportation of dangerous goods as it provides multiple levels of protection against leaks, spills, and external damages. The outer layer typically consists of a strong outer container, the middle layer might include cushioning or absorbent materials to protect the inner contents, and the innermost layer holds the actual hazardous material. This method helps ensure that even if one layer is compromised, the other layers remain intact, significantly enhancing safety during transport.

The other options do not accurately convey the central concept of triple packing. Sealing packages multiple times is not a standard definition of this term. Labeling requirements relate to conveying information about the contents rather than packaging methods. Using multiple carriers pertains to logistics and transportation rather than the specifics of how an item is packaged within its containment system. Thus, the chosen answer accurately reflects the purpose and structure of triple packing in the context of handling dangerous goods.