Hydrapak Contour 1.5L Hydration Bladder for the Lower Back. Waist packs have become a popular accessory for cyclists, hikers, and competitors, making it easier to store essential gear. The innovative Contour hip reservoir complements most hip and waist packs and impresses with its lightweight, durable design and compact size, fitting even into the tightest compartments. Special Shape-Loc grooves control the movement of water to ensure stability on bumpy or challenging trails. The versatile Contour reservoir combines functionality and comfort. Its 3D bottom, Shape-Loc ribs, and side opening ensure a secure fit in various bags. The ergonomic cap makes filling with water or ice easy and is particularly practical thanks to the flexible tab. The Comet valve closes automatically and prevents leaks; the magnet (not included) on the HydraFlex hose allows for easy attachment. Additionally, the reversible drying plug enables thorough cleaning and quick drying.