In a 3 mil, with an Al80, I can do it without much trouble.
In my dry suit, with my 95s, it involves unbuckling the waistband, shoving the tank up and to the right, and filling the dry suit with enough air to make me pretty wobbly. With Peter's HP100s, it's easier, because the valve is different, but it's still a challenge. There's no way I could turn my valve on fast enough if I jumped in the water with my air off. For that reason, I am religious about making sure I don't jump in the water with my air off and that my wing is fairly full when I make that jump. I haven't had the opportunity to do a hot drop yet, but that would make me even more paranoid.
In my dry suit, with my 95s, it involves unbuckling the waistband, shoving the tank up and to the right, and filling the dry suit with enough air to make me pretty wobbly. With Peter's HP100s, it's easier, because the valve is different, but it's still a challenge. There's no way I could turn my valve on fast enough if I jumped in the water with my air off. For that reason, I am religious about making sure I don't jump in the water with my air off and that my wing is fairly full when I make that jump. I haven't had the opportunity to do a hot drop yet, but that would make me even more paranoid.