HydraPak 42mm Filter Cap

The HydraPak 42mm Filter Cap turns compatible HydraPak bottles and reservoirs into a lightweight water filtration system. It’s a simple way to treat water on the go without carrying a separate filter setup.

Highlights

• Instant filtration upgrade
  Threads directly onto HydraPak Seeker, Flux, UltraFlask, and SkyFlask bottles with 42mm openings to create a complete filtration system.
• Clean water on demand
  Removes common bacteria and protozoa so you can safely drink or transfer water in the backcountry.
• Fast, simple use
  Drink directly through the cap or squeeze filtered water into another bottle or reservoir.
• Lightweight and packable
  Eliminates the need for a separate filter system, keeping your kit streamlined.
• Versatile setup
  Works for running, hiking, backpacking, and camp use where quick water treatment matters.

Best for

Trail runners, hikers, and backpackers who want a lightweight, easy-to-use filtration option that integrates directly with their HydraPak bottles.