AdivingBel
Diver
Comfort in the water...a mindset that as long as I have gas I can sort it out. Then, be prepared for a gas issue. As important as the rest...good self-knowledge and diving within your skills and comfort level.
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An SMB makes a wonderful float if your BC should fail. I've been there, done that and have the t-shirt.
There really is not THAT much redundant crazy gear that you have to pack.
1. Redundant air - simple 40 bottle / doubles / sidemount - Pick one
2. Thigh pocket (SMB, Spool, mask, cutter, signal device)
3. Redundant computer / tables/timepiece / etc..
Done. I can safely dive in a solo fashion with that load out on a recreational dive. The equipment listed above is not obtrusive or cumbersome. Not to use it could lead to a bad day.
You can’t fly with a pony...
For me, the main thing is to not get into situations that I couldn’t get out of in 5-10 minutes. I don’t think redundant air relieves you of that responsibility.
I carry SMBs, spool, extra mask, cutter, several signaling devices, and two computers.
But I personally don’t see that it’s worth the considerable hassle to take redundant air for most recreational diving. You can’t fly with a pony, and diving with doubles is no minor inconvenience. And there is plenty of redundant air at the surface. For me, the main thing is to not get into situations that I couldn’t get out of in 5-10 minutes. I don’t think redundant air relieves you of that responsibility.