Editing Scuba set (section)

==Harness configuration==
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[[File:Bcd - stab.JPG|thumb|left|upright|Stabilizer jacket harness]]
[[File:Scuba set with integral bag PA111713.JPG|thumb|upright|Scuba set with integral storage and transport bag]]

The scuba set can be carried by the diver in several ways. The two most common basic mounting configurations are back-mount and side-mount, and back-mount may be expanded to include auxiliary side-mounting, including bungee-constrained low profile side-mount, and the less compact sling-mount or stage-mount arrangement. A few [[diving rebreather]]s are chest mounted.

===Back mount===
Back mounted scuba is straightforward, popular and for a single cylinder well balanced and easy to learn to use. There are several variations on the configuration which have been developed to improve convenience, safety, or suitability for use with multiple cylinders.

====Stabilizer jacket====
The most common configuration for recreational diving is the stabilizer jacket harness, in which a single cylinder, or occasionally twins, is strapped to the jacket style buoyancy compensator which is used as the harness. Some jacket style harnesses allow a bailout or decompression cylinder to be sling mounted from D-rings on the harness. A small [[bailout cylinder]] (pony cylinder) can also be strapped to the side of the main back-mounted cylinder.<ref name="Zeagle pony bands" /><ref name="AP pony bands" />

====Backplate and wing====
{{Main|Backplate and wing}}
[[File:Diving - scubadiver.JPG|thumb|left|Backplate and wing harness]]
Another popular configuration is the [[backplate and wing]] arrangement, which uses a back inflation buoyancy compensator bladder sandwiched between a rigid backplate and the main gas cylinder or cylinders. This arrangement is particularly popular with twin or double cylinder sets, and can be used to carry larger sets of three or four cylinders and most rebreathers. Additional cylinders for [[Decompression (diving)|decompression]] can be sling mounted at the diver's sides.{{citation needed|date=December 2016}}

====Plain backpack====
It is also possible to use a plain backpack harness to support the set, either with a horse-collar buoyancy compensator, or without any buoyancy compensator. This was the standard arrangement before the introduction of the buoyancy compensator, and is still used by some recreational and professional divers when it suits the diving operation.{{citation needed|date=December 2016}}

====Bailout and safety harness====
Surface-supplied divers are generally required to carry an emergency gas supply, also known as a [[bailout set]], which is usually back-mounted open circuit scuba connected into the breathing gas supply system by connecting an interstage hose to the gas switching block, (or bailout block), mounted on the side of the helmet or full-face mask, or on the diver's harness where it can easily be reached, but is unlikely to be accidentally opened. Other mounting arrangements may be used for special circumstances.

====Integrated harness and storage/transport container====
[[File:Scuba set with integral bag PA111753.JPG|thumb|Diving with a scuba set with integral storage and transport bag. The Mini B scuba system is shown]]
The Mini B scuba system is an open circuit scuba set with an integral harness and soft transport/storage bag.<ref>invented by R.P.Hart{{citation needed|date=August 2024}}</ref> These units consist of a rucksack with a one size fits all harness, inside which is an air cell for buoyancy control, a horizontally mounted cylinder, and a regulator with primary and octopus demand valves, and a console with submersible pressure gauge and depth gauge, which protrude from the top of the unit when in use. Some military rebreathers such as the [[Interspiro DCSC]] and the Russian [[IDA71]] also store the breathing hoses inside the housing when not in use.<ref name="Larsson 2000" />

===Stage mounting===
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[[Technical diving|Technical divers]] may need to carry several different gas mixtures, or several extra cylinders with additional gas needed for the dive. These are intended to be used for different stages of the planned dive profile, and for safety reasons it is necessary for the diver to be able to check which gas is in use at any given depth and time, and to open and close the supply valves when required, so the gases are generally carried in fully self-contained independent scuba sets, which are suspended from the harness at the diver's sides. This arrangement is known as stage mounting, or sling mounting, the scuba sets known as stage sets or stage cylinders, and usually applies to cylinders additional to the main back mounted set or sets.<ref name="tecline" />

====Drop tanks====
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Stage sets may be cached along a penetration guideline to be retrieved during exit for convenience. These are also called [[Drop tank (scuba)|drop tanks]]. A drop tank is usually rigged to be carried in a sling mount, and has a regulator with a pressure gauge fitted and is deposited at a suitable place along the guideline, usually clipped to the line to ensure that it can be found again. The amount of gas in a drop tank can vary depending on how it is intended to be used. The gas mix must be suitable for the stage in which it will be used, and will be marked on a label, usually with the user's name, to avoid confusion. The cylinder valve is closed until the time of use.<ref name="Davis" />

====Stage-only mounting====
Similar in basic concept to side mount and may be confused with it, but does not use bungees to control the top of the cylinder. No back mounted cylinder is carried, and all cylinders are slung at the sides like regular stage cylinders, so they do not tuck in under the arms for streamlining and low profile.<ref name="Davis" />

===Sidemount===
{{main|Sidemount diving}}
[[File:Top view of sidemount diver DSC 0078 Photo by Pete Nawrocky.JPG |thumb|Top view of diver with sidemount harness]]
Side-mount harnesses support the cylinders by clipping them to D-rings or butt rails at the hip on either or both sides, and the cylinders hang roughly parallel to the diver's torso when underwater. The top of the cylinder is held under the diver's shoulder by a bungee, keeping it roughly parallel to the torso, and may also be clipped onto the harness in the shoulder area by a bolt snap for security. The harness usually includes a buoyancy compensator bladder. It is possible for a skilled diver to carry up to 3 cylinders on each side with this system.<ref name="Davis" />{{citation needed|date=December 2016}}

====Monkey diving====
Recreational diving configuration with only a single side-mounted cylinder.<ref name="Davis" />

===No-mount diving===
For some cave diving applications where there is little or no swimming involved and tight restrictions, the diver may carry one or more cylinders simply clipped to the harness or [[weightbelt]], which can be unclipped when necessary to pass through a restriction. This has been called no-mount diving.<ref name="Davis" />