Which item would typically not be considered as a potential plugging material?

Sponges are typically considered a suitable plugging material due to their ability to absorb water and fill gaps. They can expand and help create a seal against leaks, making them useful in damage control scenarios. Plugging materials are chosen based on their effectiveness in blocking water flow or sealing off breaches in a vessel.

In contrast, human bodies would be an unethical and impractical option for plugging material. Blankets and pillows may also be used in certain situations for temporary patching or insulation; however, they are not as effective as sponges. The nature of sponges allows for better adaptability to irregular shapes and sizes of openings, which is crucial in damage control efforts. Thus, identifying sponges as a typical plugging material aligns with their functional attributes in managing leaks and maintaining vessel integrity.