The Gamow Bag is portable hyperbaric chamber used to treat AMS. The inflatable bag simulates descent to lower altitude. The patient is placed inside the bag and it is inflated with air to increase the concentration of oxygen. A Gamow bag weighs about 12 lbs. Inflated, the bag is about 7 feet long and 2 feet in diameter.
At 9,800 feet (3,000 m), the Gamow Bag can simulate a descent of 4,800 feet (1,500 m). After two hours in the bag, the person's body chemistry will have "reset" to the lower altitude. This acclimatization lasts for up to 12 hours outside of the bag which should be enough time to get them down to a lower altitude and allow for further acclimatization.
Our staff does not carry Gamow bags. Use of a Gamow bag on Mount Kilimanjaro is impractical because descent is the most immediate, accessible treatment.