I use a large plastic butter tub with screen on the lid for venting. Fill it with some egg crate, add a slice of potato, add roaches, tape lid down to prevent accidental escape. Pack into small box, make sure to pad with crumpled newspaper so the tub doesn't bounce around. Poke a few holes in the box. Label LIVE FEEDERS and ship USPS, if they happen to ask what kind of feeders I always say crickets since some people have ew factor about roaches.