Dunno, if I was to do HPA again, I would just rock smaller tanks (multiple).
Carrying a 90/4500 and a 68/45 gets to your back after a while.
FYI:
You can get a scuba tank wth a ninja regulator, and just fill it yourself.. Scuba tank refills are about $20, the tank is about $100-200 or so. You could refill your tank like 20 times before that (dependent on size), unless your local field offers free refills..
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