Mike Boswell
Contributor
Most of the above, plus... Over the past year I have had two instances where somone's regulator leaked air or freeflowed and could not be fixed on the boat. So now I carry a spare regulator.
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Just look at your gear, if it is flexible or brittle, or may fail/break at an inopportune time (as if there are opportune times) then you should throw one in your kit.
Papabear, with the exception of the spare reg & masks, my list fits in an 8x5 drybox in my suitcase and flies with my scuba gear...2lbs total. Worth salvaging a dive for me or my dive bud.