What Our Gearhead Experts Are Saying: "This is my go-to for long trail runs or fast hiking days. It fits like a vest, carries like a pack, and never bounces around. The included soft flasks are super convenient, and the compression system keeps everything snug no matter how technical the trail gets." Built for speed and stability, the Deuter Ascender 13 Hydro Pack keeps us light and ready to charge through rugged terrain. Designed with long-distance trail runs in mind, this ultralight vest-style pack fits close like a garment, using wide, ergonomic shoulder straps and dual sternum straps to prevent bounce and improve airflow. The included HydraPak 500ml soft flasks sit right up front for on-the-go hydration, while gear stays balanced thanks to an internal stretch mesh pocket and external compression system. Made with 100% recycled materials and bluesign certified, the Ascender 13 is as eco-conscious as it is mountain-ready. Trekking pole holsters, GPS-ready pockets, and a hydration bladder sleeve round out a fast-moving design that performs on alpine scrambles, endurance runs, and everything in between.