Once sealed, I cut a couple of notches in the top of the packs (outside the sealed area), so that the bags can be ripped open by hand without needing a cutting tool.
Good move. In the excellent
Essentials of Sea Survival the authors point out that ripping open survival gear packed in plastic pouches becomes significantly more difficult in cold weather due to the plastic getting stiff in the cold plus loss of manual dexterity.
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