evo.com | Osprey Hydration Packs > The Osprey Dyna 1.5 Hydration Vest Pack is the go-fast option for runners who want smart storage and hydration without the bulk. Two front flasks and a minimal 1.5L profile keep things light and streamlined, so nothing gets between you and a clean, distraction-free run. Strip it down and speed it up. Hydration Included Two Hydraulics(TM) 500 mL Soft Flasks with removable WingStay(TM) stabilizers keep fluids at your fingertips. Wt: 1.4 oz / 40 grams each Front Flask Pockets With Bounce-Free Patterning and Bungee Securement 360-Degree Stretch Structured Mesh Backpanel Stabilizes Carry Mesh bluesign(R) approved 100% recycled 75D polyester airmesh Main bluesign(TM) approved 85% 70D nylon (100% recycled) / 15% spandex | Women's Osprey Dyna 1.5 Hydration Vest Pack 2026 - WM in Black | Nylon/Spandex/Polyester