The Halcyon bellows pocket(Extreme Exposure) will hold a spool, SMB, and Nautilus, along with a folding Spyderco in the top pocket, and some weight. That's usually all I need, but the pocket shorts always get packed too. Scout lights go on the shoulder D-rings, Trilobite on the waist belt. Since I don't carry my primary light on every dive, it just sits in front of the pocket when needed, secured by a weight belt buckle, otherwise it would be behind the pocket, next to the back plate.