New with tags Ultra lightweight Great for any runner, hiker, biker, kayaker, etc. see detailed description below about design features Made with 3D micro-mesh, the updated Ultra Pro offers increased comfort and ventilation, additional front and back reflectivity, simplified dual sternum strap adjustability and a removable safely whistle. It also includes even more front cargo storage for easy access to fuel and a secure zippered pocket for your phone. The stretch overflow pockets have been updated for easier access to extra layers or essentials and it can accommodate a 1.5L reservoir for longer self-supported runs.