Rich, Deformed canister didn't seem to catch your attention? Does the Cis Lunar= canister deform under pressure? Since canisters are on our backs, it is= hard to say if they deform, but I don't think mine does! At least I don't= have any leakage. I have never seen a Drager unit, but from this post I= would think it is very frail? Channeling is the the obvious danger. With a good channel set up you should= have very little breathing resistance and extremely poor CO2 absorption= outside of the channel. Nor should there be much if any noticeable= breathing resistance if you have a good channeling system set up. Death would be the big worry. I would think these problems concern both semi-closed and fully-closed syste= ms. Mike
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