UltraFlask 500ml + Filter Kit

• Fast and Safe Filtration
  Removes Escherichia coli, Cryptosporidium parvum, and Giardia Lamblia from up to 1,500 litres of water at a rate of >1L per minute.*
• Secure Grip
  Flexible structure provides a firm hold for screwing and unscrewing the filter.
• Pack-Friendly Fit
  Soft materials conform to most hydration pack and vest pockets for stability and comfort.
• High-Flow Valve
  Bite-activated, self-sealing valve eliminates drips for smooth hydration.
• Large 42 mm Opening
  Simplifies filling at streams, lakes, or other water sources.
• Compressible Design
  Reduces water movement and bulk as the flask empties.
• Included Backflush Adapter
  Restores the filter's flow rate using a HydraPak Stow or clean water bottle.

*Effectively removes common waterborne bacteria, such as E.coli (99.999%) and parasitic cysts (99.9999%) per HSF 42.