Back Country Access (BCA) doesn't think you should have to sacrifice proper hydration just because temperatures drop below freezing. They came up with a revolutionary method that doesn't just arrest the freezing process, it actually reverses it. Pretty amazing stuff! BCA designed the Stash BC with conductive mesh that harnesses heat from your body then traps it in the hydration sleeve. This technology keeps your entire hydration system ice-free so you can keep your strength and stamina up while your buddies are bonking. This pack is made of super durable nylon with stormproof zippers. Other features include ski and snowboard carry straps, so you can pack your board vertically or your skis A-frame style or diagonally. The Stash BC from BCA fits toso lengths 17-22 in and is available in a slick Stealth Black, a bright Emerald Blue and, if subtlety isn't your thing, the Look-at-me colors: Lizard Green or Flame Orange.