ultimate direction 2.0 liter hydration reservoir ii, 2.0 liter ultimate direction the ultimate direction 2l reservoir ii is essential for long days on the trail, now updated with improved material for better tasting fluids and new bite valve. 2 liter / 70.5 fl oz capacity. wide-mouth opening for easy fill and cleaning/reversing. slide rail top closure prevents leaking and provides a positive top hold. tpu tubing (no pvc) drapes better over the shoulder while still providing strength and resistance to kinking. removable-fit tube connection makes refilling and cleaning easy. silicone bit valve for easy water flow. fluid capacity measurement lines along the side. weight 123 g / 4.31 oz. fluid 2 l / 70.5 oz.