Duro W/Flask MensBuilt for fast, fun runs, this lightweight vest features included hydration, efficient pocketing and a stable, bounce free men's fit. Light, soft and packable, the Duro LT features 360 stretch structured mesh fabric that stays put while you put in the miles and two Hydraulics 500 mL Soft Flasks that keep hydration and calories handy. Two front stretch pockets hold food and supplements. Features Two Hydraulics 500 mL Soft Flasks with WingStay removable