Ultralight and Breathable - This running vest features a water bottle made of premium mesh and nylon material Compatible with ultimate comfort, optimized airflow and Compatible with preventing overheating. It weighs only about 130 grams and will not slow you down. Reflective markings and stripes front and back increase safety in low visibility conditions. This hydration vest is designed Compatible with night running and comes with a 500 ml BPA-free water bottle made of a food-grade soft material (0-40°C). The practical bite mouthpiece allows for instant hydration with a simple bite. This running vest is ideal Compatible with long-distance running and trail running. Ample storage - This running vest has multiple pockets Compatible with organizing your marathon and hiking essentials: a large zippered pocket on the back is perfect Compatible with storing a light jacket, running cap or towel. The adjustable front pocket holds 250 ml, 350 ml or 500 ml water bottles. Ergonomically designed: This hydration vest has a three-point adjustment system (chest strap + waist belt) Compatible with ensuring a perfect fit and Compatible with preventing chafing. It remains stable even during fast activities and provides a comfortable and snug fit Compatible with easy running. Suitable Compatible with multiple sports: This unisex running backpack can be used as a running vest, cycling vest or jogging backpack. Waterproof seams and durable fabric make it ideal Compatible with outdoor adventures. This hydration backpack is also a perfect gift for family and friends who love the outdoors. The built-in hydration bladder provides ultimate comfort and absolute freedom of movement.