Nalgene knows what a hydration reservoir should and shouldn't do, which is how they've built their reputation for tough, taste-free quality. Because a cool drink of water should be just that. Bladder features include:

• All bladders use only propriety Nalgene materials for maximum strength and minimum aftertaste
• Quick connect hose assembly means easy-on, easy-off when you're swapping out components or filling bladder
• "Bite Me" angled bite valve with shut-off mechanism positions the hose where you want it and prevents leakage
• Insulating sleeve keeps your favorite drink colder longer
• Generous hose length accommodates virtually any pursuit and any level of activity
  
  Available in two materials:
  
  TPE
  
• Reliably tough and beautifully versatile for the die-hard adventurer
• Special polymer does away with nearly all plastic odor and taste
• Strong soft-plastic construction stands up to wear and tear while doing away with annoying crinkly noise
• One-piece seamless tubular design means less chance of leakage or breakage
• Blue
  
  CXC
  
• The ultimate bladder for those who prefer their liquids to speak for themselves
• Unique formula means zero plastic taste or smell
• Proprietary plastic polymer was originally developed for military use
• Super tough construction results in maximum abrasion resistance
• Clear