I also keep a small filebox lined with styrofoam, a pillowcase, towel, heat pack, and cable ties (and small pair of cable tie cutters) next to my rack in case of an emergency -- or for taking my snake to the vet.
Another BP.net member posted info awhile back about taking an ordinary plastic filebox, poking a few holes, insulating with styrofoam, and presto! A secure snake carrier. The paranoid in me loved the idea, and it has worked great for vet trips, tornado warnings, etc.
BP.net so rules.....