Bail up bottle Back up

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I would recommend a 40. My first pony was a 30 and I have since sold it to pick up the 40 which I now use as an oxygen bottle and have moved to doubles. I dove the 40 as a pony prior to using it for oxygen. If it is slung properly you won't even know it's there!
 
I'm with Cave Diver... Bring whatever you need to bring to complete the dive in an emergency. Use math. If a 19 will do it... then carry a 19. If you need an 80... carry an 80 or two for that matter.
 
For penetration, I use a manifolded twin-set (doubles) and apply the rule of thirds for gas management.

You can use an independant stage/bail-out... but if you do, this should be of sufficient capacity for you to apply the same 'rule of thirds' to cover your egress from the wreck and ascent in the event of a catastrophic loss of gas from your single cylinder.

Same here on the set-up and Good Advice Devon
 

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