What is the Air2 used for?
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unless your deep inside a cave or wreck then a back up mask would be gloriousIf you need a backup mask...Then once you have put on the backup mask, it becomes "the" mask and you no longer have a backup. So if you needed a backup in the first place, it is time to abort the dive. Which is something you can do pretty easily without a backup mask in the first place.
The OP was talking about 60-100 feet ocean boat diving. Which means no caves, and very unlikely that he'll be deep in any wreck at that depth. In which case a wreck penetration line would be all he needs to braille his way out, in any case. Deep in a wreck, if your light goes out and you can't see daylight? A mask won't matter, will it?