I just checked and I use a 66qt container. Whatever size you decide to use make sure it's not clear. I also a louvered grate that has screen on one side glued to the top where I cut a hole for ventilation.
It's funny but one of my favorite thing to do is fill up the feeding bowl with food and after the light have been out a few minutes pop the top off and peek in with a flashlight. It's a roach feeding frenzy lol!