HydraPak SkyFlask Speed Soft Flask

The IsoBound double-wall insulation creates a thermal barrier that keeps your water or electrolyte mix cold for significantly longer than a standard soft flask. While it won't keep ice frozen for hours in extreme heat, it prevents your body heat from warming the liquid quickly.

Yes, the strap is fully adjustable, allowing you to customize the fit for a secure, chafe-free grip regardless of your hand size. The added thumb loop also helps stabilize the flask so you don't have to grip it tightly while running.

Yes, the SkyFlask Speed is compatible with most 42mm threaded water filters, making it a versatile option for trail runners who need to refill from natural water sources on the go.

The flexible material is designed to shrink as you drink, which minimizes liquid movement and sloshing. When combined with the adjustable hand strap, it stays snug against your palm to prevent bouncing.

The Speedfill cap is designed to be leak-proof, allowing you to toss the flask into a vest or pack without worrying about spills. It also flips open quickly for fast refills at aid stations.

Because it is made from flexible, collapsible materials, the flask shrinks down to a very small size once empty. It easily tucks into a pocket or a small storage compartment in your running vest.