- HYDRATION SYSTEM: This running vest is designed with a dedicated bladder compartment compatible with a 5L hydration bladder (includes a 2L empty bladder). Crafted from food-grade EVA, it ensures safety and durability for your hydration needs during long runs, hikes, or cycling. - MULTI-FUNCTIONAL: Constructed from waterproof nylon and elastic mesh, this hydration vest boasts a bladder compartment with a 5L capacity. It features multiple pockets: one main compartment (with bubble pocket), one secondary compartment, a spray can compartment, an umbrella pocket, a mobile phone pocket, a water bottle compartment, and an elastic rope for bundling or hanging. Perfect for runners and outdoor enthusiasts who require a hydration vest. - ULTRA LIGHTWEIGHT: Weighing only 0.8 lbs, this running hydration backpack is made from scratch-resistant, durable stretch fabrics. It is designed for both men and women, featuring an adjustable chest strap and belt for a secure fit during all outdoor activities, including running, hiking, and cycling. - BREATHABLE & COMFORTABLE: Made with high-density mesh fabric, this hydration backpack provides excellent breathability and moisture-wicking capabilities. Its ergonomic design and adjustable belt ensure a comfortable and secure fit, making it an ideal choice for those seeking a lightweight hydration vest for active pursuits. Use scenarios: 1. Ideal for marathon training sessions where hydration is crucial. 2. Perfect for day hikes where carrying extra water is necessary. 3. Great for cycling trips, allowing easy access to hydration without bulk.