Quote Originally Posted by Chip
If you question it, use a second bladder. I do, even with a dry suit and in sidemount. How much is your life worth? You can remove the bungee.

Caves aren't always sloping upwards, so a lift bag can get you into trouble with the changing depths. Imagine a bladder failure in some place like a dome room. You can try to make it neutral, but the depth (buoyancy) changes. Also, imagine a lift bag with the sharp edges in a cave. I wouldn't count on it!
Yes, I am planning on removing the bunges and working with the dual bladder wing until I can get trimmed out with it. I would much rather do that than try to rely on a lift bag.