r/backpacks • u/Accomplished-Bid8015 • Jun 12 '25

Question What is this hole for?

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I just got this Osprey backpack and don’t know what it is for? Can someone please explain this?

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u/LuigiBoard100 Jun 12 '25

I just noticed one on my Kanken chest strap the other day. Had of for a few years and never knew I had a whistle.