Wow, what streamlining. Seems the wing's rather inflated for a single too.One of my friends dives an xdeep single tank setup on recreational dives. I do not dive in a wet suit just t shirt and shorts so and prefer my Scuba Pro Black. Very comfortable and as I am a large chap use an XL size. I travel with it everywhere. You can order from online stores I bought my Scuba Pro black and had it delivered to the UK.
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Moving the waist belt D-rings forwards would solve the streamlining problem.