UltraFlask+ 500ml Filter Kit

Lighten your load and drink right from the source. We took our go-to flask and added filtration to create a system that delivers hydration without contamination. The filter — light and compact — screws on top so you can drink right from the flask. Or — if you’re carrying more water — use the system to fill a bottle or reservoir.

Features

• FAST & SAFE FILTRATION
  • The integrated filter removes Escherichia coli bacteria, Cryptosporidium parvum cysts, and Giardia Lamblia from approximately 1,500 liters of water at a rate of >1L per minute.*
• SECURE GRIP
  • A flexible and structured grip makes it easy to hold the flask while screwing and unscrewing the filter.
• VEST PACK FIT
  • Soft material conforms to most hydration packs and larger vest pockets for a secure and stable fit.
• HIGH-FLOW
  • Easy to drink bite valve auto-seals after each sip, eliminating annoying drips.
• LARGE OPENING
  • 42mm opening lets you fill the flask easily at any water source.
• COMPRESSIBLE
  • Flexible design shrinks as you drink, minimizing water movement.
• INCLUDED BACKFLUSH ADAPTER
  • Plugs into filter valve and threads onto a HydraPak Stow or bottle of clean water for backflushing the filter to restore its flow rate.

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

Specifications

• Capacity: 500 ml / 17 fl oz
• Weight: 65 g / 2.3 oz
• Dimensions: 240 mm x 70 mm / 9.4 in x 2.8 in
• Material: TPU, Silicone POM, Hollow Fiber, ABS
• Care: Avoid freezing filter. Freezing may ruin the hollow fiber membrane. If in freezing conditions we recommend you keep the filter in your pocket or near your body to prevent freezing.