A favorite from Backpacker magazine's 2017 gear review, this is the Cotopaxi Veloz 6 running vest.
The vest includes a pocket capable of holding a 2.0 liter reservior (reservior not included).
The vest-style nylon shoulder straps form a snug “V” around the neck and chest for stability while running.
In terms of storage, there are zippered bandolier-style pockets on both the straps, perfect for quick-access items like energy bars. A 20-inch diagonal zipper allows easy access to the interior, which features a small zippered mesh pouch. There is an additional a 10-inch-long diagonal zippered pocket on the outside of the pack for small items like sunblock and bug spray. An external stuff pocket has room for gloves and a hat.
This running vest is no longer in production. I would like to see it find a good home.