I would get a box and crumple up a bunch of newspaper to cushion him, then put him in a snake bag (or pillow case with lower thread count) and set him in there for the trip. Make sure you have the car very warm also. 5 hours isn't that long relatively speaking. Just make sure he stays warm and you should be ok. I would also follow the protocol for acclimation once you reach your destination- i.e. no handling and wait a week before offering food. Depending on your feeding schedule, make sure he has an empty stomach before you make the trip, that will reduce the chance of regurg.