Originally Posted by choster
Then you need to remember to pull only one of the tabs-- pull both and you'll be to big to fit easily through that window exit, dooming those behind you, with nary a sharp object to puncture it to be found....
You're not supposed to inflate it in the cabin (or at least not at your seat).
With the growing size of Americans, a large number of people would have trouble getting through the window exit in the first place--without the jacket inflated; their best bet would be to try to inflate once they are through the window.