The UltraFlask 500ml + Filter Kit is a compact and efficient solution for safe hydration, designed to provide clean water on the move. With a flexible and compressible design, it fits securely in hydration packs and vest pockets, ensuring stability and comfort while reducing bulk as you drink. The 42mm wide opening allows for easy filling at water sources, and the bite valve delivers smooth, drip-free sips with every drink. The secure grip simplifies attaching and removing the filter, while the included backflush adapter restores flow rate for long-lasting use.

 

Removes Escherichia coli bacteria, Cryptosporidium parvum cysts, and Giardia Lamblia from up to 1,500 litres of water at a rate of >1L per minute.*

Flexible structure provides a firm hold for screwing and unscrewing the filter.

Soft materials conform to most hydration pack and vest pockets for stability and comfort.

Bite-activatd, self-sealing valve eliminates drips for smooth hydration.

Simplifies filling at streams, lakes, or others water sources.

Reduces water movement and bulk as the flask empties.

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.