What Our Gearhead(R) Experts Are Saying:"I've used the Duro Pro 10L on big mountain runs and long training days, and it's hands-down one of the most stable vests I've tried. The fit hugs the body without feeling restrictive, and I can grab snacks or layers without taking it off. The pole carry options are dialed, and the included flasks make it race-ready right out of the box."We reach for the Osprey Duro Pro 10L Running Vest when efficiency, stability, and access matter most. Built in collaboration with elite athletes, Osprey designed this vest to keep up with the rigors of long-distance trail running and ultramarathon racing. Every feature serves a purpose-from the bounce-free fit to the seamless access pockets-keeping us moving fast without breaking stride. Constructed with bluesign(R) approved recycled polyester and spandex, the Duro Pro 10L stretches comfortably and breathes easily when the pace heats up. Its intelligent storage layout includes pass-thru lumbar and upper back pockets for quick gear swaps, front flask pockets for hydration, and a zippered compartment for emergency items. Three pole carry options and an included quiver add versatility, while the dynamic fit ensures balance mile after mile. Whether chasing podiums or personal bests, the Duro Pro 10 helps us perform our best when every second counts.