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Beanojones pretty much covered the different times when you might want to inflate the bag. I'll just add that, if you are going to inflate it at depth and send it up, this is a skill that's well worth practicing in shallow water to begin with, because there are many ways to get tripped up in it. You have to learn how to keep the bag and the line away from your body, so you don't get tangled in it, and how to inflate the bag (using whichever technique you elect to use) without losing buoyancy control. It's not actually difficult, but most of us have found that our first efforts were something less than graceful.
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