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jmsdiver · 05-01-2002, 10:42 PM,

He was probably referring to twin tanks, with manifold, and dual regs, one on the right and one on the left with an isolator. But, we all know how assumptions go.... I would consider a Spare Air for traveling because you don't need it vis'd when you get to you destination, works well for most rec diving, and easy to pack and typically no extra charges unless you declare it. For diving around here: go with the pony. More options for configuration, more air (30 cuft vs 3 on the spare air), and true redundancy. I agree with diving with a buddy and using them as your redundant air source. Also, you need to determine what kind of diving you wish to do in the future; twin tanks with manifold and isolator may be in the future, but that's a lot of expense for just starting to dive.