we took roo and roswell to the vet in a small 5 $ plastic mouse thing. just make sure it is dark enough, and like everyone else said, no direct sunlight. i would also not blast the stereo very loud. may upset them more if they are already upset. but i could be wrong on that. i wouldnt think it would make them happy. i would think 3 hours is a bit of a trip, but not too much to mess with them that bad. i think the local petco made the snakes more stressed just by being there then a car drive would.