One of the toughest tasks in designing a good hydration pack is striking a balance between capacity and mobility. A vast majority of hydration pack users prefer high-impact activities like trail running or speed ascents. The challenge for most manufacturers is designing a stable pack that balances storage space with a large-capacity hydration bladder. The Reservoir Hog is the largest capacity hydration daypack made by The North Face and features an aluminum-reinforced PE sheet suspension and equalizing hip suspension pads to help balance loads while running or climbing. Through the use of an adjustable, dynamic suspension and a pivoting harness, the pack moves with your body for enhanced mobility. In addition to the 70 oz. MSR CloudLiner bladder system, the Reservoir Hog has over 1,460 cubic inches of cargo capacity-over twice as much space as the popular Sliquid hydration daypack. The non-PVC based hydration bladder material is FDA approved, heat and cold resistant and will not impart any taste to the water or other hydration liquids.