Forsoothe!
Imperial Masterpiece
If the water vapor can't escape the bag the humidity in the bag will be in the high 90's% and transpiration slows down greatly. Wet a plant normally, put it in a clear bag, blow it up with you breath, seal it, put it where it gets a couple hours of indirect sunlight and watch the atmosphere equalize and form a film of moisture on the inside surface. It can stay like that for some weeks. A grey mold will form on some surfaces, but that's not as bad as it looks and washes off well enough.
I have shipped many tropicals back from FL to Detroit like that, in winter, bare-rooted, and never had a problem. If the moisture level is trapped the whole process slows down to nothing. UPS parcels go from terminal-to-terminal and the closed trucks on the road stay just warm enough in the sun to prevent damage to plants in the 3 or 4 days in-transit.
I have shipped many tropicals back from FL to Detroit like that, in winter, bare-rooted, and never had a problem. If the moisture level is trapped the whole process slows down to nothing. UPS parcels go from terminal-to-terminal and the closed trucks on the road stay just warm enough in the sun to prevent damage to plants in the 3 or 4 days in-transit.
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