News — Costco

The underappreciated first step when it comes to taking care of your hydration reservoir—that bladder-like bag that sits for extended periods filled with water inside your hiking or cycling pack—isn’t actually about cleaning it. (We’ll get to that in a second.) “You need to wash your reservoir, yes, but the big component people forget about is drying it,” says John Weir, manager of Bentgate Mountaineering, an outdoor store in Golden, Colorado. “You don’t want to seal it up, put it in the garage, and let it fester.” How do you dry it? Easy. Flip it upside down or turn it...