What defines secondary packaging in the context of transporting specimens?

The definition of secondary packaging in the context of transporting specimens is accurately represented by the choice that describes it as the container that holds the primary receptacle and must be leak-proof. Secondary packaging is essential because it serves as an additional layer of protection, containing the primary receptacle that holds the specimens, which could potentially leak during transport. This protective measure is crucial for maintaining safety and compliance with regulatory requirements, ensuring that hazardous materials do not escape and pose a risk to handlers, the environment, or the public.

The emphasis on the leak-proof characteristic is particularly important as it directly relates to the safe transport of dangerous goods, particularly biological samples or chemicals that could be hazardous if released. In addition, the proper design of secondary packaging ensures that it can withstand various transport conditions, providing further security.

In contrast, other options focus on aspects that do not encompass the full definition of secondary packaging. For instance, while tamper resistance is relevant for certain shipping scenarios, it does not specifically define the function of secondary packaging. Similarly, the shipping label and reusable containers, although important in their respective contexts, do not pertain directly to the role or characteristics of secondary packaging in transporting specimens.