I use this with my Camelbak MULE backpack to prevent the mouthpiece from jumping on my foot when I'm riding my road bike and going downhill. Very annoying when it bounces there and annoying when trying to tuck it somewhere in the harness while moving. the tube rests while driving. The magnets are quite strong, and simply placing the end of the mouthpiece in close proximity will give you a satisfying click as the magnets click. Definitely recommend to anyone having a similar issue or just wanting to keep their hydration tube where you want it while you're active.
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