I drive about 4 hours with my snakes in the car (it's only 2 though) and I keep them in plastic bins with locking lids. I put a few pieces of paper towel in the bottom, and I wrap up some hand/foot warmers in a few layers of paper towel to keep them warm. I'll usually cover most of the bins with my sweatshirt of jacket so that they can't really see out and see what's happening.