Salomon ADV Skin 12 Set (Past Season)The choice of demanding endurance runners, the ADV SKIN 12 offers more personalization in both fit and function. An updated sensifit and closure system make this pack even more comfortable for your unique body shape, and the 12L volume offers enough space for longer endurance races. Hydration The integrated soft flasks make it easy to drink as soon as you feel thirsty, and stays balanced when you run, so you can push the limit and stay hydrated.