Description: 【Essentials Hydration Vest for Outdoor Enthusiasts】: Designed for those who love outdoor activities, this hydration backpack running vest ensures comfort and convenience, enhancing your outdoor experiences 【Lightweight and Breathable Material】: Made from polyester and nylon, this hydration pack is lightweight, quick drying, and breathable. It features reflective strips for added safe and comfort during your activities 【Organized Storage Solutions】: Keep your essentials neatly organized with dedicated phone and water bottle compartments. Note that the water bladder is not included 【Ample Capacity】: Equipped with a spacious back compartment to accommodate keys, water bladders, rain jackets, and other necessities, ensuring you stay hydrated during any outdoor adventure 【Versatile Use Across Activities】: Greatly suited for running and hiking, this backpack is also ideal for cycling, climbing, rock climbing, fishing, and more Specification: Material: Polyester and Nylon     Size Chart: 32cmx37cm/12.60inchx14.57inch Water bottle compartment 18cmx10cm/7.09inchx3.94inch, Suitable for soft water bottles below 500ml  Mobile phone compartment 20cmx10.5cm/7.87inchx4.13inch Package Includes: 1 Hydration Backpack Running Vest Note: Please allow slightly errors 1-2cm differences due to manual measurement.