MSR Hydromedary Hydration Bag Tough: Made with rugged 200-denier Cordura High Flow/No Leaks: Bite valve dramatically increases flow rate, while shutoff valve prevents leaks Easy to Fill: Low profile, ergonomic handle and wide-mouth opening for no-hassle filling Upgrades Most Packs: Three streamlined shapes fit most hydration packs and backpacks Safe Drinking: BPA-free