Support yourself on long runs with the CamelBak Ultra Pro 34oz Vest. This vest is made from 3D vent mesh that maximizes airflow and comfort throughout your run. Its dual sternum straps stabilize the pack, eliminating uncomfortable bouncing that distracts you from your PR. 2 Quick Stow flasks provide easy access to 34 ounces of water (plenty to keep you hydrated until you get home) while an assortment of pockets let you stash a layer, snacks, energy gel, and whatever else you may need.