Inov-8 Ultra Flask 0.5 with 10 Tube - Clear Black

Designed to eliminate accidental leaks, the Inov8 Ultra Flask is equipped with an auto-sealing high flow phaser bite valve and a twist-locking cap which shuts off all flow to the valve. Refilling this durable, lightweight flask is a breeze thanks to the large 42mm cap entry, whilst the soft and flexible design ensures it shrinks down as you drink, reducing water movement as you run. This particular model features a 10" tube which can be used with a standard top or straw depending on your preference and as it is made from abrasion resistant TPU can be filled with both hot and cold liquids.