We're using a closet for an incubator next year, but this year we used a couple of Hovabators. Due to the size of the incubators, we had the vermiculite right in the bottom, and didn't use seperate containers (they wouldn't fit).

I don't think I'll be doing that again, we had a heck of a time retrieving one of the hatchlings that decided to crawl up into the wafer thermostat. lol