Worms have a tendency to burrow down to the bottom of a bait box. But with both units when the worms burrow to the bottom, flip it over and there are the worms. They allow you to get worms without digging or disturbing the other worms. Their handy size and built-in carrying handles make transporting bait easy. Opening is made easy with the extended cover edges and the strong cord holds the covers in either open or closed positions. For high-insulation value, an expanded polystyrene material is used. Are ideal small portable bait containers.