Contour Lumber 1.5L - Performance Lumbar Hydration. Waist packs have become the new go-to option for carrying cycling essentials on hot laps, shorter rides, and race days. Designed to be lightweight and rugged with a slim profile to fit in smaller spaces, our innovative Contour™ Lumbar reservoir is a perfect hydration upgrade for most lumbar and hip packs. Equipped with performance features and Shape-Loc baffles to stabilize water movement, it’s ready to tackle rowdy and steep lines.