A rig on a duty belt which is just another way of naming what used to be a LBE belt (load bearing equipment), can be snapped around your waist in a second no matter what you're wearing. For example, when shtf and you're defending your property it's one of the rigs or the main rig you could wear, ready for trouble. If you were sleeping while others took a guard shift and trouble hit, you'd wake up snap on your rig lickity split and head for action. There designed for tough use and to carry what needs to be carried.Yeah...I didn't name it.
I'm guessing they were well into the Jack when they came up with the name. If I was wanting to carry some weight yet not so much as to need a back pack or vest, a duty belt system would be an option.
I kind of like the concept. I just can't come up with reason (yet) where I'd need one or could get some use out of it.