Be careful when freezing hydration

It freezes very easily! Be careful of hydration under zero

The story goes that while I was busy using the extremely convenient hydration, I was hit with a great deal on Mt. Yatsugatake in late autumn.

The other day (November 3rd) I traverseed Akadake to Yokodake on Yatsugatake for the first time in a while, and although I had expected, I was hit by a strong cold wave, and the temperature was around 6 degrees below zero in the early morning hours on the ridge. a comparison test for the hydration that I released the other day , so I was walking out the tube normally, and within an hour the water in the tube was frozen, and no matter how many times I inhale it, the water wouldn't come out (photo below). I didn't intend to test that much this time, but I unexpectedly learned firsthand that hydration has a thin mouthpiece and tube, and is extremely vulnerable to freezing.

At the time, I had brought another bottle with me so I was able to deal with it without any serious problems, but it was a bit chilling to think about what would happen if I had only brought hydration. By the way, even a tube with a heat-retaining cover ended up freezing in a few hours, so to be honest, it would be better to assume that the heat-retaining cover is not reliable at the moment. So, personally, I don't recommend hydration in winter. Even if you bring it with you, we recommend that you always use another bottle (including heated bottles) and bring it with you at that time!

Hydration that was easily frozen in Yatsugatake, below freezing temperature