For future reference, I have a 28 qt Colmen cooler. 8 decent quality pillow cases. And well over 16 shipping heat packs on hand. At present I have six male ball pythons, I live in Chicago. On the rare occasions we lose power, everyone gets bagged and moved into the cooler. I add a couple heat packs and some crumbled news paper. And usally have no problem waiting the couple hours for the power to be turned back on. I also recommend drilling a few very tiny holes in the cooler for them to breathe.