How we recommend
We recommend gear by category and use, not by brand, and do not quote prices. We may earn a commission on purchases at no cost to you.
Get trained
This page explains what training agencies, standards bodies and diving medicine bodies publish. It is not a substitute for training and certification from a recognised agency, and it does not replace medical advice.
Training and your instructor come first
Buoyancy control is taught, not bought. In a review of 947 recreational open-circuit scuba deaths from 1992 to 2003 (Denoble and colleagues, Undersea and Hyperbaric Medicine, 2008), buoyancy trouble was the disabling agent in 13 percent of the cases that could be classified. No BCD changes the need for training and practice with an instructor, and we never say that a particular BCD is safe or certified. An instructor or dive professional can see how a diver dives, which a buying guide cannot.
On servicing, SSI says the maker's service schedule should be followed.
What every BCD has
PADI says a BCD lets a diver float at the surface, rest on the bottom or hover mid-water, and holds the cylinder. It lists three essential parts: a low-pressure inflator with an option to inflate by mouth, a deflator, and an overpressure relief valve. Its 2013 guide adds optional accessory pockets, a cummerbund waistband and quick-dump valves that release air without raising the inflator hose.
What the standard covers
The European standard is EN 1809:2014+A1:2016, "Diving equipment, Buoyancy compensators, Functional and safety requirements, test methods". The Estonian catalogue lists the consolidated version as valid from 4 April 2016. Its scope covers inflatable devices that let a diver control buoyancy and that may carry the breathing equipment or weights, and it specifically excludes life preservers, personal flotation devices and rescue devices, including combined buoyancy-and-rescue devices. In other words, the standard does not treat a BCD as a life jacket. A standard sets minimum requirements and test methods; it is the maker's marking, not this page, that says whether a product claims to meet it.
Our picks by category
Jacket BCDs
PADI calls the jacket the most popular style for recreational diving: harness and bladder are one unit, with the bladder along the back wrapping forward under the arms. SSI says a jacket inflates front, back and sides and holds the diver upright at the surface. PADI advises trying a BCD on while wearing the exposure suit you will dive in, and checking that the inflator hose suits your regulator set-up.
Best for: Most recreational divers
Back-inflate and wing BCDs
SSI says back-inflate BCDs inflate only behind the diver, for a streamlined horizontal position, and describes wings as a harness with a back bladder, high lift and many custom options, popular with technical divers and those carrying extra cylinders. PADI said in 2013 that wings were growing in popularity for single-cylinder recreational diving. Wikipedia (secondary) describes the backplate and wing as modular, with a steel plate adding negative buoyancy that can replace some ballast and aluminium suiting divers who need less weight or who travel.
Best for: Divers who want a streamlined position, and technical divers
Weight belts and pockets
PADI says most people float, so divers carry weight, and names three approaches: weight belts, integrated weight pockets in the BCD and small trim weights. It lists a quick-release feature as standard, so a diver can drop enough weight to float. Wikipedia (secondary) says integrated BCD capacity is usually lower than a belt's, which can matter with thick cold-water suits, and the dry-suit maker DUI says the conventional belt is still the most widely used system, especially in rental equipment (maker statement). How much weight you need and where it goes is worked out with your instructor.
Best for: Divers setting up their own weight system
Other styles
PADI also names sidemount systems, a back wing with a harness that carries cylinders at the diver's sides, and lightweight travel BCDs. Our research did not cover sidemount configurations in depth, so we do not pick them. Agency courses beyond entry level are covered on specialty certifications.
Lift
SSI defines lift capacity as the weight a BCD can hold up at the surface. It says cold-water divers in thick suits, and technical divers with several cylinders, need more lift than warm-water divers in light gear. Wikipedia (secondary) says wings come in low, medium and high volumes. Matching lift to your set-up is a question for your instructor or dive professional.
A dry suit is not a BCD
DAN's Alert Diver (2012) cautions against using a dry suit in place of a BCD. See wetsuits and dry suits.
Buoyancy and the reef
NOAA's Florida Keys National Marine Sanctuary links buoyancy to reef protection: it asks divers to avoid all contact with the reef and to keep hoses, regulators and other gear streamlined and secured. See protecting reefs and marine life.
Care
PADI says to rinse a BCD inside and out with fresh water after each use, dry it away from direct sun and store it partly inflated in a cool, dry place with the weights removed. SSI adds that the maker's service schedule should be followed. More on care and storage.
Sources
- PADI, buoyancy compensators
- PADI blog, BCD styles (Brandon Scott, 9 November 2013)
- SSI blog, scuba diving BCDs explained
- Wikipedia, Backplate and wing (secondary)
- Estonian Centre for Standardisation, EN 1809:2014+A1:2016 consolidated
- PADI, weights
- Wikipedia, Diving weighting system (secondary)
- DUI, using the DUI weight system in open water training (maker, search summary)
- DAN Alert Diver, Get Wet, Dive Dry (Michael Menduno, Q1 2012)
- Denoble et al., Common causes of open-circuit recreational diving fatalities, Undersea and Hyperbaric Medicine 2008
- NOAA Florida Keys National Marine Sanctuary, tips for being a responsible diver