What Our Gearhead(R) Experts Are Saying:"This vest is perfect for long trail runs and fast-paced hikes. The harness design feels secure and comfortable, with plenty of pockets for quick access to essentials. The included HydraPak(R) flasks are easy to reach, and the Z-Pole carry system is a huge plus for technical terrain. It's my go-to for extended outings when I need hydration and storage without any bulk."Built for endurance athletes and distance enthusiasts, the Black Diamond Distance 4L Hydration Vest combines lightweight construction with strategic storage and hydration solutions. Featuring an innovative running harness suspension, this vest molds comfortably to our body, allowing freedom of movement with minimal bounce. High-stretch side panels and a self-bound stretch mesh edge enhance fit and comfort on the go, while dual flask pockets hold two included HydraPak(R) SoftFlasks(TM) for easy hydration access. Designed with ample storage for essentials, the vest includes a zippered chest pocket, lumbar pocket, and quick-access side pockets, along with an over-the-shoulder Z-Pole carry system for tackling technical terrain. With lighter color options for visibility and temperature regulation, the Distance 4L Hydration Vest is a must-have for high-paced adventures.