Lightweight Running Vest with Hydration Bladder - Your Ultimate Outdoor Companion Ultra-Light & Breathable Design Designed for endurance athletes, this running hydration vest weighs only 130 grams (4.5 oz), providing unparalleled comfort during long-distance activities. Made from high-quality, breathable nylon, it ensures durability while keeping you cool and dry, making it an ideal choice for running, trail running, cycling, and hiking. Customizable Fit for Men and Women Achieve the perfect fit with fully adjustable shoulder and chest straps that cater to various body types. This hydration pack for running boasts an ergonomic, bounce-free design that stays securely in place, offering maximum comfort during intense activities like ultramarathons or long-distance running.