What is a necessary feature of containers for contaminated sharps?

A necessary feature of containers for contaminated sharps is that they must be puncture-resistant. This is crucial because sharps, such as needles and blades, can easily pierce through materials that are not sufficiently strong. Puncture-resistant containers are specifically designed to withstand contact with these sharp objects, preventing accidental injuries to workers who handle the disposal units and reducing the risk of contamination and infection associated with sharps injuries.

While other qualities, such as being transparent or lightweight, could be beneficial in some contexts, they do not address the primary safety concern. Additionally, containers made of glass would not be practical for sharps disposal due to the risk of breakage, which could pose additional hazards. Therefore, the key characteristic of puncture resistance is paramount in ensuring the safe handling and disposal of contaminated sharps.