Nathan Soft Flask with ExoSpine Hydration Flask Size:OS Lightweight construction works as a

Lightweight construction works as a standalone piece or a mid-layer under a shell or jacket

moisture-wicking fabric moves sweat off your skin fast

Cold mornings in the deer stand or on the trail call for simple

Blue/Yellow

Pertex Quantum mini-ripstop recycled polyester shell is wind- and water-resistant without adding bulk

Nathan Soft Flask with ExoSpine Hydration Flask Size:OS Lightweight construction works as aFor runners who need clean, reliable hydration on long efforts or race day, the Soft Flask with ExoSpine is our pick for vest based hydration setups. ExoSpine ribbing keeps the flask from collapsing as it empties, so you get consistent flow without fighting the squeeze. Rolls up tight when dry, so you're not hauling dead weight late in a run. ExoSpine ribbing prevents mid squeeze collapse, giving you consistent, easy flow even when the flask is