Paulmal
Contributor
I can sling an AL80 if wanted. I'm too cheap to buy more then one pony so I just make the 40 work.
I doubt I'll ever do tech diving or cave diving though...
An Al40 is a great deco bottle for cave diving, if you need more gas go with an Al80 or two, but most Cave diver I dive with do dives with Al40's but also have 80's for bigger dives.