So, like I posted in a previous thread, I'm moving and need heat packs for my reptiles for the car ride. What types are good? They're two leopard geckos and, even if my car will be warm, I'd feel more comfortable if they had some additional heating on the way. I'm not sure if the type they sell over the counter are good for this. Searching on Google just gives referrals to ship your reptiles which isn't what I need.