Wore twice. RUNNING HYDRATION VEST FOR WOMEN: The infusion of 3D Micro Mesh, ultra-lightweight materials, and reflectivity make the CamelBak Women’s Circuit Hydration Vest the preferred choice of trail and ultra runners looking for a minimalist running vest. CRUX RESERVOIR: The Women’s Circuit Running Vest includes a 1.5-liter Crux reservoir container that is made from BPA-free materials and delivers 20% more water per sip. BUILT FOR COMFORT: Our Women’s Circuit hydration vests are engineered for optimal comfort. The 3D Micro Mesh provides multi-directional air flow, while the dual adjustable sternum straps improve adjustability. TONS OF STORAGE SPACE: Our durable running vest features a secure zippered phone pocket, a stretch overflow pocket perfect for rain gear, and pockets specifically designed for Quick Stow flasks.