Write down the accurate answer of the given question
Question- A question on Travel (Are parachutes allowed on airplanes as cabin baggage?) got me to wondering: hypothetically,
Part 1- what items could the "über-paranoid" passenger or pilot bring on-board to potentially save their life in an emergency?
I.e. a parachute, oxygen, a portable smoke hood?
Part 2- What are the technicalities? I.e. would a parachute be of any use above a certain altitude? What about with oxygen?
I want experts help to clarify the technicalities.