What Our Gearhead® Experts Are Saying: "I grab the Dyna LT when I want to keep things fast and simple. It’s so breathable and low-profile that I forget I’m wearing it after the first mile. The dual soft flasks fit perfectly up front, and the back pocket has just enough space for an extra layer or gels without adding bulk."When we’re chasing PRs on the trail or logging miles before sunrise, the Osprey Dyna LT Hydration Pack delivers the essentials without slowing us down. Built with Osprey’s signature comfort-first design, this minimalist running vest hugs the body for a bounce-free fit that moves naturally with every stride. Two included soft flasks make hydration effortless, while mesh panels keep airflow steady through long climbs and hot conditions. Every detail of the Dyna LT is tuned for efficiency. The quick-stash rear pocket swallows a windbreaker or gloves, and the adjustable dual chest straps provide a custom, stable fit no matter how rough the trail gets. Constructed from 100% recycled nylon with a PFC-free DWR coating, this pack proves that lightweight performance and sustainability can go stride for stride.