A leather bag about the size of a human head and it has an extradimentional space inside. It holds enough air in it for a single human to breathe for 1 hour. It comes with a tube for use.
To fill the bag, just open the large top pocket in an environment with breathable air for 1 minute, then close it. You can fill it with unclean air, such as a poison gas cloud, but then it will remain poisoned thereafter. Solid objects placed in the bag may tear the lining and lose the object into the astral plane. It might also contaminate the bag with dust, dirt or other things and pose a choking hazard on the next use.
As with all extradimentional space items, placing it in a bag of holding or similar item, will cause the requisite planar rift explosion. (See Bag of Holding)
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