I've been using a Thumlers tumbler for a few years. I got the smaller one because I mainly hobby shoot handguns and do not need a large tumbler for either quantity or larger rifle shells. This particular tumbler has a rubber band type closing device that snaps around the lid to secure it. I learned the hard way not to use too much detergent. I was tumbling in the garage and suddenly the sound changed. The soap apparently caused enough pressure to blow the lid off. I now set the tumbler on blocks in a pan should that happen again. I know the larger tumblers have a different way of securing the lid but I thought I would mention it anyway.