In regards to size, Eddie exacted my sentiments. As far as insulation goes, anything smaller than 3/4" in my opinion is garbage. Think about it, sometimes you may be shipping a $2000 or more snake in that box. Does the extra pennies really make that much difference. The whole purpose of an insulated box is to keep a stable temp for the snake inside. #/4" is your best bet a regulating temps in the box. We used to use 1/2" years ago, and after my first order was depleted, I never ordered them again. You won't be able to ship in either extreme with the 1/2".
I hope that helps,
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