The Deuter Ascender 13L Hydration Pack is designed for trail running and hiking. It includes two shoulder strap pockets for soft flasks and an interior compatible with a 3L hydration system. The wide, ergonomic vest-style shoulder straps provide a close fit with elasticated compression for comfort. The pack features a lightweight construction with recycled fabrics, an elasticated compartment for wet items, and a secure interior for valuables.