The 0.5L Ultraflask features a high flow phaser bite valve and a 10" tube to be used as a straw. No matter what your preference the Ultraflask will be capable of meeting the demands, A large 42mm cap entry allows quick and easy refilling at race checkpoints saving valuable time. The two-in-one functionality of the Ultraflask means the tube can be removed or the high flow bite valve installed on the cap directly, adapting it to fit the desired position of the race vest. The 10" tube can be cut to the desired length and assembled with push fit hose connections. The Ultraflask is perfect for those fast and light days comming in at only 48g, with a soft, flexible and super-durable TPU. The bottle compresses as the fluids are consumed, reducing any water movement.