Protect my pc from moisture

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Titan
Moderator
Is that for shipping or normal operation?

For shipping, sure, you can bag it.

For normal operation, unless the PC is built for very low power, it will most likely end up overheating and shutting down so bagging is not a good idea. In this case, you might want to simply reduce airflow through the PC to increase temperature which will incidentally reduce relative humidity within the case.