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@walkonmars I don't think it really matters what kind of diving he's doing. The OP said that he's 6'5" and a 117 is going to be uncomfortably short. Good call for someone that's your height and needs that amount of gas, but when you're tall, the short tanks really suck when you have to sit. I use HP120's or LP120's *cave filled to ~150cf* when diving in backmount because they're more comfortable.