In his case, probably both.
But I think he may actually have a good point. Not too many OW students are wearing 21 mil around their torso in class. I cave dive wet most of the time with a 7 mil hooded vest, 7 mil farmer and 7 mil top...I still get cold on long deco...ok it's been crushed a few times and I am in the water for a while, so maybe that is a bit more than most, but try and take your tanks off in something you might dive on a staged cave dive and not end up on the ceiling without a bit of steel hanging on you...ah, be prepared to HANG ON to that reg...wooohooo.
Bob Cree
Based on the comment about using a safet sausage, I have changed out the lift bag for a sausage that has an oral inflator, dump valve, and an end that can be opened and fill using a regulator.
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