Ultraflask+ Filter Cap Size:42mm The powerful and patented MirageDrive

The powerful and patented MirageDrive with Glide Technology and Kick-Up Fins allows for smooth sailing in all conditions

and odor resistance of Merino with the comfort of an interlock knit

contoured design of the Snagless Slotted Padeye looks great and has no snag points

An excellent choice for lightweight backpacking

Our Free Range Fleece Vest is a no-frills base layer or cool day warmer

Ultraflask+ Filter Cap Size:42mm The powerful and patented MirageDriveRun fast, filter faster. The UltraFlask+ Filter Cap threads seamless onto all of HydraPak's 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. 9999%) per HSF 42.