I would not do it regularly, but for a 1 time thing, it should be ok.
Here is what I did when I had to take 2 snakes the the vet recently. I put each one in a separate snake bag/pillowcase. I put them inside an insulated box, and filled the remaining space with crumpled newspaper. I used handwarmer type heat packs to keep the box warm, and brought my accurite with me, with the probe in the box, to keep an eye on the temps, since I didn't know how well the hardwarmers would work. I had 2 of the hardwarmers tucked down inside socks (to make sure they would not be in direct contact with the snakes through the thin fabric of the snake bags) in the corners in the bottom of the box, and 2 more taped the the lid (it was a fairly big box, and the hardwarmers were tiny). As it turned out, that was pretty good, but a little too much heat, so I'm glad I had the accurite to keep an eye on it. I just opened the box to let some heat escape every once in a while, and it worked pretty well.
I was probably a little over obsessive with getting the heat just right, since the reason I was taking them to the vet was for an RI caused by the flexwatt failing and them getting chilled, but it never hurts to be sure.
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