My club has a RIB, which means limited room for kit. There was therefore a rule that only one twinset could be put on the boat at any time, and twinsets could not be used for simple dives - just too bulky.
This obviously could have put a serious crimp in my diving, so I had to argue my case that I was not taking up more than my fair share.
From the Faber website:
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Diameter of a 12L cylinder:
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178-203mm
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When it came to my club, I borrowed a fellow club member’s 15 + pony setup, and I was done : My 7L twinset was exactly the same width as the pony setup, and nowhere near as thick.