Urination and Defecation in Zero-G
Astronaut Russell Schweickart talking to Peter Warshall


A highlight:

'In Apollo, for feces you just stuck a plastic bag on your butt which was 6 inches in diameter' something like that' maybe a little bit less 12 inches or so long and the mouth of it had a flange at the top with an adhesive on it, and you'd peel the coating off the adhesive and literally stick it to your butt. Hopefully centrally located. And if you think you know where your rear end is, you really find out, because you'd paste it on very carefully! So, you stick that to your butt, and then you go ahead and take a crap. But then the problem comes, because there's no particular reason whatsoever for the feces to separate from your rear end. So as a result the problem is left as an exercise to the student to peel the bag off and make sure everything stays within the bag, and get all wiped off. It's basically a one hour procedure.'