The hydrapak soft flask 150ml softflask vs gel packets no contest simpler faster and cleaner this lightweight 150 ml collapsible gel flask allows for instant nutrition on your most challenging expeditions just fill it with up to 5 gel servings squeeze it empty and yoursquore ready to take on the world hydrapak soft flask 150ml features the sf150 flask fits easily in most hydration vest belt or pack pockets soft material conforms to any pocket for a comfortable carryi