I've got a Mystery Ranch Blackjack pack (uses the Wary system), and activated the bag once just to try it out. It filled quickly and held a lot more pressure than I expected, could easily bounce a quarter off the inflated bag. After deflating, the bag folded back up easily - a whole lot easier than the BCA Float 30 I used to have, which is a pain in the butt to stuff back in its tight pocket.
