HydraPak Ultraflask 500ml + Filter Kit

• Flask and filter sold together, ready to go.
• Filter removes bacteria and protozoa.
• Fits most vest front pockets.
• Flask shrinks as you drink, so no slosh.
• Easy to carry on long mountain days.

• Flask capacity: 500 ml
• Weight: 65 g
• Dimensions: 240 x 70 mm
• Flask material: TPU, BPA-free and PVC-free
• Flask valve: Bite valve
• Opening: 42mm
• Filtration: Hollow-fibre membrane, removes 99.999% of bacteria such as E. coli and 99.9999% of protozoan cysts (brand testing)
• Filter lifespan: About 1,500 L
• Flow rate: More than 1 L per minute
• Use: Drink through the filter or squeeze into another container
• Included: Backflush adapter
• Maintenance: Flask is reversible for cleaning, backflush the filter to restore flow

• Long trail missions with natural water sources
• Mountain runs and fastpacking trips
• Runners who want filtration without pumps or tablets

Less suited to: Road runs and races with aid stations, where filtering is not needed. For that, look at HydraPak flasks, such as the Ultraflask Speed.

Buying the flask and filter together takes the guesswork out of making them fit. It suits runners heading into the Southern Alps and other places where streams are the only water. The pieces can also be used separately, which helps.