How old is the bowl? I think they are generally made from green wood otherwise it would crack before the bowl could be made. Once it's "turned" or made, it dries out pretty quickly. Instead of cracking, the bowl just flares open or closed a bit.
So if the bowl is more than 2-3 months old, I'm guessing it won't need any attention. If it's younger than that, the bag idea is probably what I'd do for a month or two. But hopefully someone with more know-how chimes in...
On second thought, if it's at 60% moisture content when they make the bowl, and it dries out pretty fast once it's turned into a thin curvy bowl, it's probably used to dramatic moisture losses. So after a few weeks, moving it somewhere drier may not be a big deal.
Apparently I don't really know. Sorry
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