Nathan Storm Hydration bottle A truly unique way to carry your fluids. The 1 liter Contoured Hydration Bottle fits comfortably in the small of your back while the freeze-free cap remains ready to replenish you with essential fluids. Large enough for necessary provisions for multi-hour excursions, the Storm is great for serious training or casual fun in the sun or snow. • Thinsulate® bottle compartment keeps fluids hot or cold • Twin zippered pockets on waistbelt • Airmesh moisture-wicking backing and 1.5" wraparound waistbelt • Shock Cord compression/accessory attachment • Headphone port