The Dyna 1.5 Running Backpack from Osprey was designed for running, ideal for those who like to run fast and light. This vest-style backpack allows for a comfortable fit and reduces bouncing of the pack. It has two adjustable chest straps. Of course there is an integrated water bag pocket. There are also runner-friendly gadgets like an LED light loop to keep you visible and reflective graphics. 2 adjustable, removable chest straps. Integrated water bag pocket. Included: 2x 250ml Soft Flask bottles with spout and extension tube. Loops for attaching poles to backpack. Zippered pocket for valuables or phone. Side stretch mesh pockets. LED light loop. Reflective elements. Made from 100% recycled materials.