I just flew my 1969 T337D from Seattle to Indiana, PA. I removed the old system bottles, and they are heavy, because I was advised it is very expensive to replace the parts to get them approved.
I purchased a 24 cu Nelson O2 system. I can carry the tank with hand it is so light. The tank straps onto the back of the seat or anywhere else you want to put it.
Three of us used it for almost six hours at FL 150 and 170 and there is almost a half of tank left. I chose this tank based on an article comparing tanks in Aviation Consumer.
The old tanks are sitting in the hangar.
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