I choose my bail out depending on the dive profile. It is never anything smaller than a 40 cu ft of air for dives <130 feet. I never rely on an onboard solution. Deeper/longer dives, usually involve a second 40 cu ft of 50% or 80%. Trimix dives involve carrying a deep bailout, usually a 63 cu ft of mix, and the rest based on the team strategy. We dive as a team of 3.
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