The rig manager is made for someone who probably uses a lot of little bits and pieces, like all of us you can never have to many little boxes. They are very good well locked down so don't open accidently, and as I found out the boxes float. The tackle manager is one of those boxes that useg is ownly limited by what gear you may have, I will get another one soon, mine holds one 8 compartment hookbox, one fox 8 compartment box, one four compartment box,one large three compartment box,Twenty feeders, seven reels of hook lenght line and in the spool case a few bits and bobs. and I could use another box.