Good question! I just got back this week from the desert and I can tell you that the temp and humidity can be on both extremes rather quickly. Usually the gars get sent in a tupperware type container, (water/air tight and durable); and the best thing I found to work were water pillows. *(donated by one of our very own here, thanks again).
The only exception is that there is no distilled water available to them so bottled water is all that can be used. I did not experience much difficulty with it, but would suggest that a small bottle from someones house with some distilled in it, could be added and appreciated.
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