This is how I do it. It works for me.

1. Snake gets put in a pillow case or snake bag tied off of course.
2. Get a old towel, throw it in the dryer for 15 to warm it up (right before you leave). Put snake in box with the warm towel and boogie out the door in to the car.
3. Turn car heat on super blast and dehydrate myself on way to and back from the vet.