this post was submitted on 04 Sep 2026
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That bag probably has enough air volume to last someone around 5 minutes (give or take, probably give since that's based on adult respiratory rates, and that's a kid) before noticeable symptoms of hypercapnia (too much CO2, which will become a problem before oxygen deprivation does) start setting in.
Depending on how wide the river is, that's not actually too much of an issue.