Historically second Compressport running vest has been developed with cooperation with elite trail runners who placed in the well-known ultra-trail race UTM. The Compressport ULTRUN S PACK is designed so you can have all of your essentials with you during this 170 km long race. This vest weights unique 80 grams. The front is equipped with two pockets for 500 Ergo Flasks, 600 ml Ergo Flask can be horizontally placed in the lower back pocket, all easily accessible during your runs.