Why are small oxygen tanks(that fit in backpacks) not made available anymore?

Some people are too weak to carry the "D" tanks, they need the "C" tanks.

I am unaware that they are unavailable … I still see them being offered …

One Response to “Why are small oxygen tanks(that fit in backpacks) not made available anymore?”

  1. I am unaware that they are unavailable … I still see them being offered …
    References :
    RRT-NPS

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