Featuring a 500ML soft bottle and a high-capacity reservoir bladder, this hydration backpack is designed for active lifestyles. Its adjustable shoulder straps provide maximum comfort for activities like jogging, cycling, and hiking. Suitable for outdoor enthusiasts engaging in camping, climbing, skiing, hunting, or mountaineering, the reflective elements improve safety during low-light conditions. Stay energized during fitness routines, gym workouts, and adventurous travels with this practical hydration companion. Material: Polyester. Specifications: 21x7x36cm/8.27x2.76x14.17 inches. Weight: 250g. Packing method: OPP bag. Due to different lighting and screen settings, the item color may be slightly different from the picture. Due to different manual measurements, please allow a 1-2cm difference in size. Product list: 1 piece * running hydration pack, 1 piece * 500ml water bottle. Visibility for Low-Light Use: High-visibility reflective details amplify nighttime conspicuity, catering to runners and cyclists who prioritize safety during their early morning or evening pursuits. Convenient Hydration Access: Equipped with an integrated water bladder compartment for continuous fluid supply during workouts, allowing one-handed hydration access effortlessly and assuring dependable performance while exercising. Long-Lasting Backpack Fabric: Combining sturdiness with comfort, this backpack uses tear-proof fabric that maintains its form while offering lightweight portability during adventures. Promoted Accessibility: Combining a secure zippered front pouch with an organized main compartment layout, this hydration backpack integrates a water-resistant phone pocket for dependable gear management and protection in various environments. All-Day Wear Support: Pressure-distributing cushioning reduces muscle strain over time, featuring adjustable chest and waist buckles with ergonomic shoulder straps for balanced weight support during outdoor activities.