I go to thrift stores and look for insulated coolers with a tight lid or insulated large drink containers with lids. They will not escape from the bottom if you donot put holes in the bottom. It is not necessary. A damp newspaper on top provides all the moisture needed. I feed mine just corn meal about twice a week and keep them in the garage. I do have tiny air breather holes in the lid usually done with a large heated needle. About 150 holes should do it.