HydraPak UltraFlask+ 500ml soft flask and filter

The soft flask HydraPak UltraFlask+ 500ml is a lightweight and compact hydration system equipped with an integrated filter that allows you to drink directly from the source safely. The filter screws onto the top of the flask, effectively removing 99.999% of common waterborne bacteria such as E.coli and 99.9999% of parasitic cysts, including Cryptosporidium parvum and Giardia Lamblia, in compliance with HSF 42 specifications. This system can purify approximately 1,500 liters of water at a rate of over 1 liter per minute, offering maximum flexibility: it can be used to drink directly from the spout or to fill another bottle or hydration reservoir.

The design is optimized for outdoor sports and trail running. The UltraFlask+ features a flexible and structured grip that makes it easy to screw on or unscrew the filter. The soft material fits perfectly in most hydration vests and backpack pockets, ensuring a stable fit. The high-flow bite valve seals automatically after each sip to eliminate drips, while the wide 42 mm opening allows for quick and easy filling. Additionally, the compressible structure shrinks progressively as you drink, minimizing the annoying sloshing of water during movement.

Included in the package is a backflush adapter that connects to the filter valve and screws onto a HydraPak Stow flask or a clean water bottle, allowing you to clean the filter and restore its original flow rate. With a capacity of 500 ml, the system weighs just 65 grams and measures 240 mm x 70 mm. It is made from TPU, POM silicone, hollow fiber, and ABS. Regarding maintenance, it is important to prevent the filter from freezing, as sub-zero temperatures can damage the hollow fiber membrane; in cold weather, it is recommended to keep the filter in your pocket or close to your body to preserve its integrity.