If the ride is reasonably short and the weather is not to either extreme, your snake should be fine. You just recently got your BP, right? If so, you could use the container you brought it home in for transport. Otherwise, I would put it in a pillowcase and wrap a rubber band securely around it to keep it closed. Avoid having the snake in direct sun, or where the heat or a/c in the car is blowing directly on it.