For a start, a manifolded set of twin 15's or 17's is regarded as 'de riguer'. Most of the Floridian cave systems are 30m or so deep, and therefore require a good quantity of gas to give sufficient dive duration. Whilst on the subject of gas, nitrox is almost universal in its use by Cave divers in North Florida. The amount of decompression avoided by using nitrox as opposed to compressed air is quite significant. The regulator first stages and hoses are configured to be streamlined and allow the cylinder valves to be accessible.
Most divers use a steel backplate and harness configuration to mount the manifolded cylinders on.
In between the plate and the cylinders lies the wing for buoyancy control. With this set up, all the components are bolted together in order to prevent anything falling off during the dive. The other major benefit of this simple set up is that all the equipment is easily accessible and user friendly. The primary light is usually a canister design, capable of long duration with a powerful bulb. The primary is mainly attached to the waist belt of the harness, but occasionally they are mounted under the cylinders.