Salomon fine tuned the Skin Pro 15 Set Hydration Pack for fast paced mountain adventures like trail running, mountain biking, or speedy hiking. Its SensiFit construction uses stretch paneling in key areas to ensure a secure, one size fits all design, and the MotionFit Trail design provides freedom of movement while simultaneously preventing any bouncing on rough terrain. The Skin Pro's shoulder straps, waist belt, and back panel feature power stretch mesh to wick moisture and ventilate. This pack includes a Hydrapak 1. 5L reservoir tucked inside the internal, insulated sleeve. There's another zippered pocket inside, as well as two zippered side pockets outside. The front stretch pockets accommodate most water bottles, and the SensiCompression straps ensure a secure load.