Has anyone mentioned sidemount yet?
You get superb streamlining, trivially easy shutdowns, full redundancy, not to mention a host of other benefits such as amazing trim, total control, ability to squeeze into tight holes. The gift that won't stop giving! Oh, and you can have a 2.1m/7' hose bungeed to the cylinder, stashed neatly out of the way.
The minor downside is it takes a little more effort to initially configure your kit.
You get superb streamlining, trivially easy shutdowns, full redundancy, not to mention a host of other benefits such as amazing trim, total control, ability to squeeze into tight holes. The gift that won't stop giving! Oh, and you can have a 2.1m/7' hose bungeed to the cylinder, stashed neatly out of the way.
The minor downside is it takes a little more effort to initially configure your kit.