The buoyancy of a backplate is usually considerably negative, particularly when the plate is made from stainless-steel, and so can change a lot of the body weight that may or else be worn on the weightbelt. Ancillary options that will typically be existing in jacket BCDs, like pockets or pounds https://vuf.minagricultura.gov.co/Lists/Informacin%20Servicios%20Web/DispForm.aspx?ID=11164732