HydraPak 42mm Filter Cap

• Converts your HydraPak bottle into a lightweight filtration system.
• Fast‑flow hollow‑fibre membrane for efficient drinking and filling.
• Removes bacteria and protozoa — no chemicals, no waiting.
• Flip‑top cap for quick access on the move.
• Compatible with HydraPak’s 42mm soft flasks and reservoirs.
• Ultra‑light and packable — ideal for trail missions and travel.

• Filtration: Hollow‑fibre membrane
• Removes:
  - 99.99% of bacteria (e.g., E. coli)
  - 99.99% of protozoa (e.g., Giardia, Cryptosporidium)
• Flow rate: High‑flow squeeze‑compatible design
• Thread size: 42mm
• Compatibility:
  - HydraPak Flux™
  - HydraPak UltraFlask™
  - HydraPak SkyFlask™
  - HydraPak Seeker™ 42mm
• Lifespan: Up to 1,500 litres of filtration
• Cap style: Flip‑top for quick drinking
• Weight: Approx. 57 g
• Materials: BPA‑free, PVC‑free
• Use: Drink directly through the cap or squeeze into another container
• Maintenance: Backflush to restore flow rate

• Trail running and fast‑packing
• Long missions where water sources are uncertain
• Travel and backcountry adventures
• Runners who want filtration without carrying a pump or tablets
• Pairing with HydraPak soft flasks for race‑day simplicity

The 42mm Filter Cap is one of the simplest, most efficient ways to stay hydrated on New Zealand trails. It’s lightweight, fast‑flowing, and integrates seamlessly with the HydraPak bottles runners already use. For missions where you want to move fast and refill from streams with confidence, this cap is a game‑changer — no pumps, no chemicals, no hassle.