OMS backplate with adjustable harness, double bungee wings with two inflators, boots on cylinders, manifold with remote isolator.	Adjustable harnesses are actually very hard to adjust properly. The clips are fragile and break easily or can open by accident. Bungee wings deflate and will not hold air if they are punctured or a dump valve sticks. They trap more air when "empty" too. Oral inflation is very difficult underwater. Bungee is easy to snag. Double wings are only needed when the diver is overweighted (steel stages) and they cause tremendous drag. Boots get in the way and promote corrosion. Remote isolators are the worst in laziness, and full of failure points.
Regulator hoses point out sideways. The long hose is not breathed, so it is coiled and stuffed in the wings' bungee, and the second stage is hung from a retainer. Both regulators are Poseidon Jetstreams/Odins.	All hoses should point downwards for streamlining. Breathe the long hose. If it hangs in a retainer then the mouthpiece can be pulled off when it gets grabbed. A stuffed hose may not pull free cleanly, it's impossible to replace if it comes out. It may get trapped when the wing is inflated. Poseidon regulators freeflow too easily, Jetstreams are impossible to clean underwater and horrendously expensive to maintain. They take a special breathing technique which gets forgotten under stress.
Back-up lights are in a pocket. Reels are clipped to d-rings on the cylinders. Lift bags in bungees against cylinders.	You need to find a back-up light quickly if the primary fails. Grabbing it should be instant, but not if it is in a pocket. Anything clipped to the cylinders is remote and easily lost or entangled.
Primary light is a Kowalski hand-held lantern on a 1/2m lanyard, or a Custom Divers cannister clipped to holes in the edge of the backplate. Small lights on a helmet.	Turbidity varies, so the light beam needs to be adjustable to cope with a variety of situations. Lanterns cannot and they also take up a hand, and long lanyards will get snagged. Anything attached to the backplate cannot be removed easily underwater if it gets trapped. Helmet lights blind your partner, they confuse signalling and the backscatter will blind the diver in silty water. The helmet itself causes drag and gets in the way of the manifold and traps hoses.
Neoprene drysuit is inflated from an argon bottle clipped to the edge of backplate.	Neoprene suits are easily damaged and hard to repair. They lose buoyancy and thermal insulation at depth when they compress. Again, never clip anything to the plate.
Stage bottles are 10 litre steel stages, with spring gate clips attached directly to metal rings on the hose clamps. Stage bottles are worn on opposite sides and gases are told apart by different colours of regulator.	Steel stages are negatively buoyant and will sink the diver like a rock, which is why huge, double wings are needed. Having them opposite sides causes drag, they flap when the diver swims and stops the long hose from being wrapped. They are too heavy underwater to wear on the same side. Metal to metal connections cannot be cut if they get trapped or snagged. Identifying a gas by the regulator is suicide, there have been many fatalaties caused by this. It is too easy to get the wrong regulator on the wrong bottle.
Dive is planned using Proplanner.	Proplanner is about the worst dive planning tool on the market, it is overpriced, out-dated and difficult to use.