Good idea to use a cooler. Well insulated, light weight. How much could it hold at one time? I like it but I don't know if I trust it. This coming season I am going to have hopefully have a butt load of eggs and I do not have an incubator big enough to hold all of them yet. So this is a good idea but I just don't know. The commercial incubators are so expensive. I was going to make one out of a old refrigerator but that thing is heavy. Definitely something to think about.