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- I'm a Fish!
If I know that will be the case, I have been a proponent of mixed mount. Dive with a single tank on your back with a long hose, pressure gauge, and wing inflator, and use a left side sidemount bottle. Non traditional, but it's not often I'm going to be technical diving on open circuit in those areas.Trust me, there are places in the world where you are unable to find doubles. In such scenario grabbing two tanks even with the same valves saves your day.