I just got a large tote from walmart, one of the clear ones with a locking lid, i cut a large square out of the lid and put 1/4 inch hardware cloth over the hole for better ventilation. just have to make sure the tote is all smooth on the inside. I have had a pair of rats in this setup for a while now and no problems. If you dont use the wire on top you have to drill alot of air holes high on the tote or condensation will build up.