New answers tagged biking
If you only use PET bottle try to put a neoprene sleeve around them. Neoprene is used to insulate the tubes of the so called "hydration systems", that is those bladders with a tube going from the bladder to your mouth when you want to suck water from it. Neoprene works pretty well both in keeping the heat in winter and the opposite as you need. It doesn't ...
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