What is the role of absorbent material in the shipping packaging for specimens?

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The key idea is that absorbent material in specimen shipping is there to soak up any fluids that might leak from the primary container. In compliant packaging, the specimen sits in a primary container inside a secondary container, with absorbent material placed so that if the liquid escapes, it is absorbed and contained. This protects handlers, prevents contamination of the packaging, and helps meet safety and regulatory requirements during transit. Absorbent material also serves as part of the leak-prevention system rather than just filling space, aesthetics, or being used for attaching labels.