Osprey Duro LT Run Hydration Vest is a lightweight, streamlined running vest designed for long-distance comfort and stable, bounce-free carry. It includes two 500 mL soft flasks and breathable 360° stretch mesh for easy access to hydration and fuel on the move. Key attributes: Black | Nylon | Breathable airmesh backpanel | Bounce-free stability | Lightweight and packable | Secure, quick-access storage | Includes two Hydraulics 500 mL soft flasks with WingStay stabilizers | Dual lightweight adjustable elastic vest closure cords | Front flask pockets with bounce-free patterning and bungee securement | Vertical-zip front pocket with removable tuckaway safety whistle | Dual front stretch mesh food/supplement pockets | Spacious pass-thru lumbar pocket | Key clip | Streamlined vest design | 360-degree stretch structured mesh back panel | Front and rear reflective details | Dimensions & fit: SM: 15.7H x 13.8W x 1.2D in / 40H x 35W x 3D cm | MD: 16.5H x 15W x 1.2D in / 42H x 38W x 3D cm | LG: 17.3H x 16.1W x 1.2D in / 44H x 41W x 3D cm | Adjustable vest closure for a customizable, secure fit | Multiple sizes available (S, M, L); minimalist contact for maximum ventilation | Composition & care: 85% nylon, 15% spandex | 100% polyester (mesh) | Hand wash cold only. Do not tumble dry, bleach, use fabric softener, iron or dry clean.