With a wide 42mm cap and high-flow valve, the SOFT FLASK 500ml/17oz STD 42 makes staying hydrated faster and easier, so you can focus on the trail ahead. Shrinking as you drink to limit water bounce, the flask lets you know exactly how much you have left. The wide 42mm cap with a high-flow valve makes it even easier to refill the flask, drink quickly on the move and add ice cubes to keep cool. The soft, flexible flask shapes to fit your pocket for extra comfort and shrinks as you drink to minimize water bounce. The intuitive high-flow valve makes drinking easier, so you can stay hydrated however fast youre running or tired you are. Large 42mm opening makes it easy to fill with ice or energy mixes High-flow valve 100% BPA & PVC free TPU & RF welded seams for superior durability, abrasion resistant and elasticity Wide working temperature range (frozen - max temp 60°C) Volume: 0.5 L Weight: 33 g