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I've received many replies both on and off list and based on the assumption
that there are other people around here trying to figure this out, I'll see
if I can put what I got in some sort of order.

1.  Inflating a liftbag by sticking a second stage in it and mashing the
purge button is rarely the right answer.  If the water is cold, there is a
chance of icing and freeflow.  If the goal is to put up a deco line,
breathing gas is wasted.  If neither of these is true, it may be a loss of
an opportunity to practice for when one or both of them is true.

2.  For a deco line or just getting the bag to stand up to get the rigging
straight for a lift, using the exhaust of the second stage in use (either
tilt the head to the side or look up) solves both concerns.

3.  For lifting signifigant amounts of weight (as opposed to holding up a
deco or marker line), either use a separate cylinder just for filling the
bag or use the BC inflator.  Either venting the BC into the bag or inflating
and venting the BC simultaneously will do the job, although the second
technique would seem to require quite a bit of practice.  A procedure of
venting and then reinflating the BC as the bag is released would be more
controlled.

4.  Using enclosed bags involves having another LP hose and costs unbreathed
gas, so it would have to be a planned lift as opposed to an emergency deco
line deployment.

*****

There are people here much more comfortable with a freely ascending liftbag
than I am.

Based on what I saw, we could talk for a few days just on hooking a personal
deco line to a wreck.  ;)


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