Not really, brah. For a week or two, it’s fine. But for long-term storage in your garage or shed, you should take them out. Trapped moisture can lead to delamination and mildew, especially in humid climates. Store them upright in a board rack or on their side in a cool, dry place. The bag is for transport and short-term protection, not for a multi-season hibernation. Let your boards breathe.