Filter water effortlessly wherever your adventure leads. The HydraPak 42 mm Filter Cap transforms any 42 mm‑threaded Seeker water storage bag or Flux flexible bottle into a fast, reliable filtration system.
This versatile cap allows you to squeeze clean water into other containers or drink freshly filtered water directly from compatible HydraPak bottles and flasks—including Seeker, Flux, UltraFlask™, and SkyFlask™ models.
Engineered for backcountry performance, the Filter Cap uses advanced hollow‑fibre technology to remove 99.99% of E. coli and parasitic cysts, delivering safe hydration at a rapid 1 L per minute.
With a lifespan of approximately 1,500 L, it provides long‑term confidence on the trail. A protective dust cover and high‑flow nozzle ensure clean, convenient drinking—no need to touch the spout with dirty hands.
Lightweight, compact, and built for seamless compatibility, this cap is an essential upgrade for anyone seeking a streamlined, packable water‑treatment solution.
Features
LIGHT & COMPACT
Weighing just 57 g, the Filter Cap is one of the lightest filtration options available. Its compact form stores neatly or threads directly onto your Seeker or Flux without adding bulk.
DUST‑COVERED HIGH‑FLOW NOZZLE
A protective dust cover keeps the nozzle clean. The high‑flow spout opens and closes easily with one hand—ideal for quick hydration on the move.
42 mm THREAD COMPATIBLE
Designed to fit HydraPak’s 42 mm Seeker water storage bags, Flux bottles, UltraFlask™, and SkyFlask™ handhelds, as well as most popular 42 mm backpacking bottles and soft flasks.
FAST, SAFE FILTRATION
Removes 99.99% of E. coli and parasitic cysts. Filters up to 1,500 L of freshwater at a rate of 1 L/min, providing clean drinking water quickly and reliably.
SAFE & RELIABLE
Removes Escherichia coli, Cryptosporidium parvum, and Giardia lamblia (99.9%). Constructed from BPA‑free and PVC‑free materials for worry‑free use.
Specifications
Weight: 57 g
Diameter: 42 mm
Materials: PP/POM, EPDM, Silicone, Hollow Fibre
