Studio grade microphones are sensitive to dust. Over time dust can collect on the diaphragm and degrade the sound quality. I've been told that putting a plastic bag over the microphone when it's not in use will prevent this. I've also been told that it is better to use a clothe covering because a plastic bag will promote condensation on the diaphragm. My view is that the plastic bag will not be totally sealed off. This will mean that the humidity inside and outside the bag will be equal and that the bag will not result in extra condensation on the microphone diaphragm. Am I correct?