How do I travel with a snake?

I need to take my ball python to the vet tomorrow and I’m not sure how to properly get her there. It’s VERY cold out and I need to keep her warm. I also need it to be easy to put her in and out. I’ve heard of putting them in pillow cases and a then a cardboard box, but I’m worried that’ll make her temperment go down{very friendly now} or stress her out. Is there any place that sells battery operated heat pads…if they exist? Thanks to all!


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