Which material should cotton swabs be packaged in?

Cotton swabs should be packaged in paper because it is breathable and allows for moisture evaporation, which is essential for preventing the growth of mold and bacteria on biological samples. Paper packaging ensures that any moisture associated with the cotton swabs can escape, reducing the risk of contamination, degradation, or decay of the samples.

In contrast, plastic wrap can trap moisture, potentially compromising the integrity of the samples. Padded envelopes, while providing some protection against physical damage, may not offer the necessary breathability required for biological materials. Metal canisters are also not suitable because they can create a completely sealed environment that encourages moisture retention. Hence, paper is the best choice for packaging cotton swabs in a manner that maintains their viability for forensic or biological analysis.