With a thermomoulded bottom wide 42mm cap and high-flow valve the SOFT FLASK 500ml/17oz SPEED 42 makes drinking refilling and storage even faster and easier so you can stay focused on the trail ahead. Shrinking as you drink to limit water bounce the flask lets you know exactly how much water you have left. Compatible with all Salomon caps featuring a 42mm opening (purchased from Spring 2020 onwards).