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These are emergency kit - specifically to help those suffering health problems due to altitude. As I understand it they are used within the climber's tent or bivouac, which provides the shelter req...
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#1: Attribution notice removed
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System
·
2020-05-27T11:08:46Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/8388 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/