The SoftFlask straw attachment allows you to easily swap between a high-flow bite cap or a straw accessory for in pocket use while out in the wilderness, you choose your flask configuration. Fits all 42mm diameter Hydrapak soft flasks with the large diameter top to fit ice cubes to help keep fluids cool while out in the wilderness. Can be combined with our Magclip to keep the straw secure during bumpy rides. Features a high flow Phaser Bite Valve for fast hydration on the go.