REVOLUTIONARY WINTER HYDRATION BACKPACK FOR CROSS-COUNTRY SKIING The NORDIC 10 is the perfect winter run/ski hydration pack thats developed for the long and cold adventures, when XC-skiing, Running and Mountain biking. The pack comes with 10 liters of storage in total, including a 2.0L hydration bladder and our revolutionary Thermo Cell insulation technology that eliminates freezing of the drink tube and bite valve even in the most extreme weather conditions.