In a first, an American woman used a suicide pod to take her own life. The process took place in Switzerland. It’s done by pumping in only nitrogen gas, so the person will lose goes dizzy, loses consciousness and eventually dies. Enter futurama memes.
Pretty sure suicide bags don’t have much in the way of fit tests, either, and I mentioned the comfort issue in my very first comment in this chain, no need to revisit it. An air leak into your nitrogen supply is always going to be a problem, possibly a bigger one in the reusable product than the one-off. It only has to work well enough one time.