Re: 3.0CF spare air (too much drag for freediving?)
I have had an otterbox strapped to my back freediving with no real problems. You notice it's there at first, but if you relax while freediving you shouldn't be kicking all that hard to begin with. I can't imagine a spare air bottle would be a lot of drag. That being said I would hesitate to encourage any sort of false sense of security. If used as mentioned I don't see the harm though.
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