I use a small candy bowl. It's about 4" around and 2" deep. Yes they can jump out but they don't. I will get a pic when I get home tonight. It's really nothing special, it just keeps the crickets under control. I started this by using the bowl to feed my frogs by dropping a few crickets in there so the frogs could at least find a few and discovered that all the crickets in the enclosure ended up in the bowl by morning.