HydraPak Ultraflask 42mm Filter Cap bis_hidden 5g -Sugars 4

5g -Sugars 4

Filters at >1L/minute

Generous 475ml capacity for more of your favorite hot or cold drink

Back Pad 100% Polyester (recycled)

80 Denier GORE-TEX Pro Most Breathable Technology across the shoulders

HydraPak Ultraflask 42mm Filter Cap bis_hidden 5g -Sugars 4Filtration For Runners Overview Run fast, filter faster. The UltraFlask+ Filter Cap threads seamless onto all of HydraPaks 42mm running flasks and handhelds for a lightweight, straightforward filtration solution. Featuring a traditional bite valve and cap design, runners can drink freshly filtered water directly through the high flow Blaster valve. *Effectively removes common waterborne bacteria, such as E. coli (99. 999%) and parasitic cysts (99.