Farmer John

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A little off topic here, but I'm a bit curious about the the buoyancy characteristics of a 7mm fullsuit vs. a 7mm john/jacket setup. I understand with the less neoprene I will be less buoyant, and likely have less variability at depth.

Anyone have an idea roughly how much less weight will I need with the fullsuit? 1lb? 2lbs? 4lbs? The fullsuit is brand new, the jacket/john is an old rental unit with who knows how many dives on it...
 

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