As I do travel by commercial air frequently, and I am just the kind of person that thinks that way, I do prepare for what I would do in such an emergency.

My PSK and some supplemental items go in a fanny pack that I can wear and does not interfere with exiting the aircraft through an emergency exit (yes I have practiced it). I supplement the PSK with a Heat Sheet, 550 cord, flashlight and enhanced water purification capability.

I my under seat carry on is usually rain gear that I can put on if time permits before exiting the plane. I will also stuff my pockets with anything I can grab out of my carry on if there is time. When traveling I do tend to wear clothing with lots of pockets just for that purpose.

Yes I am crazy I guess, but I have gone down in 2 helicopters and 1 airplane (all on military operations). I am always thinking in terms of risk assessment and mitigation, even if I am just going to the corner store.