About This Ultimate Hands-Free Hydration System: This running vest delivers truly hands-free hydration with its included 500ml running water bottle (BPA-free soft flask). The easy-access bite valve and secure, anti-slosh pocket design eliminate all bouncing and noise, letting you focus purely on your run Lightweight & Premium Breathable Fabric: Stay cool with our ultralight running gear. Crafted from highly breathable, premium nylon with ventilated mesh lining, this hydration vest weighs only 7.05oz. It delivers superior moisture-wicking comfort and ventilation without bulk, keeping you focused on your performance Secure, Bounce-Free Fit for All Runners: Achieve a personalized, bounce-free fit. Featuring adjustable chest straps and side compression cords (fits 25”-60” chest), this small hydration backpack locks securely to your body, minimizing movement and chafing for maximum stability during running, hiking, or training Smart, Organized Storage for Essentials: Conquer long runs with this versatile water backpack. Our hydration vest features a smart pocket layout for all your running gear: two front flask pockets, a secure zippered pocket, a mesh snack pocket, and a rear gear pocket. Everything stays organized and within easy reach Multi-Sport Versatility & Safety: This reflective running vest ensures safety with enhanced low-light visibility. marathon, trail running, or just enjoying a leisurely jog, it's the versatile and reliable hydration backpack for all adventures. An ideal gift for outdoor enthusiasts Overview Brand : Maelstrom Color : Green Material : Polyester Sport : Running, Hiking, Cycling, Jogging Item Weight : 10.56 ounces