Description of MSR 3L Hydromedary™ Hydration Bags The most durable hydration system available. These bags are built with the same tough “MSR® red” 200-denier Cordura® as our DromLites™ and feature a new high-flow/no-leak bite valve, a low-profile easy-fill/carry handle, and three streamlined shapes that fit most packs. Features: Made with rugged “MSR red” 200D Cordura. New bite valve dramatically increases flow rate, while new shutoff valve prevents leaks. New handle makes filling and carrying bags easier than ever. Three new streamlined shapes fit most hydration packs and backpacks.