I agree with CALM Pythons, & also, you can use jars of hot water to keep bagged (!) snakes warm inside a "cooler" (or styrofoam shipping box). The insulation will keep in
enough warmth for 8-9 hours, at which point you change the water. (I found this out during a 4-day power outage from an ice storm, & all my snakes were fine...in fact, they were FAR more comfortable than I was, lol.) But yes, I've even put snakes in my shirt on occasion- you do whatever you have to do, make the best with what you have.