Quote:
Originally Posted by miles
I believe it works like this.
They get one for launch off, one for the return into the atmosphere, and a backup.
I can only imagine how much strain is on the body when you are traveling in excess of mach 5.
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They also have one for every EVA planned, and probably another spare or two for those planned on going EVA.
Interestingly enough, they were first used for just female astronauts, the men used external catheters, the the women pointed out how well they worked, and the ease of use, so the men switched.