Built for fast, fun runs, Osprey's Duro LT Run Hydration 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. PRODUCT FEATURES: Two Hydraulics 500 mL Soft Flasks with WingStay removable stabilizer included 360-degree stretch structured mesh backpanel stabilizes carry Dual lightweight and adjustable elastic vest closure cords Front flask pockets with bounce-free patterning and bungee securement Vertical-zip front pocket with removable, tuckaway safety whistle Front and rear reflective details for safety Key clip Dual front stretch mesh food/supplement pockets Spacious pass-thru lumbar pocket No pole-carry with this vest Adjustable and removeable dual chest straps for additional stability Front harness gear and food organization pockets Airmesh bodywrap for maximum ventilation, stability control and soft, irritation-free contact surface Multiple sizes and gender-specific fit for long trail comfort Minimalist body contact for minimalist fit and maximum ventilation This product meets bluesign® PRODUCT requirements, which means materials and components have been selected that adhere to rigorous third-party environmental and social criteria during production. Hand wash cold only. Do not tumble dry, bleach, use fabric softener, iron or dry clean. Dual stretch food/supplement pockets, a vertical-zip front pocket and a spacious pass-thru lumbar pocket provide streamlined storage. A stable 360-degree stretch backpanel, dual sternum straps and refined flask pocket patterning with dual anchors eliminate bounce. Two Hydraulics™ 500 mL Soft Flasks with removable WingStay™ stabilizers keep fluids at your fingertips. Wt: 1.4 oz / 40 grams each