Staying hydrated is faster and easier than ever, so you can focus on the trail ahead. The Salomon S/Lab Flask 500 ml features an anatomical, tilted design that fits comfortably close to your body on your S/Lab Ultra 10 Hydration Vest. Details: High-flow valve Conical shape Inclined cap for quicker use Large 42 mm opening TPU and RF welded seams Exclusive to the S/Lab Ultra 10 hydration vest