When it's hot enough to have the Camelbak on, I'm also sweating. That means all that goes in one location doesn't come out in one location on the other end, youknowwhatImean? Works for me... as always, YMMV.
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They are also good for keeping your body cool when its hot.
Have kept mine next to my body when it is filled with ice and water.
They are a good thing to have when traveling all day in the strong sun.
always to remember to keep the water going during your ride.