Nathan

Pinnacle 18oz Ins. Soft Flask

What Our Gearhead® Experts Are Saying:

"I reach for this one on hotter days when I want more water and cooler sips. The insulation really helps during long runs, and the grip-free strap keeps my hand relaxed so I’m not squeezing a bottle the whole time. I also like having the stash pocket for a gel and my key during marathon training runs."

Hot miles demand hydration that stays cool and easy to carry. The Pinnacle 18oz Insulated Soft Flask from Nathan Sports keeps fluids cooler longer while letting us hydrate without breaking stride. Whether we’re grinding through marathon training miles, cruising rolling trails, or tackling warm-weather long runs, it delivers quick hydration without forcing us to grip a bottle the entire way.

The insulated soft flask holds 18 ounces of fluid and compresses as we drink, keeping the bottle compact and bounce-free as the run continues. Nathan’s ExoSpine internal structure provides stability and shape while still allowing the flask to collapse naturally, and the breathable mesh strap contours comfortably to our hand for a relaxed, grip-free carry. A small expandable pocket wraps around the carrier, giving us just enough space for a gel, keys, or small essentials during longer efforts.