Designed with the demanding specifications of champion ultra runner, Stephanie Howe, this latest version of our lightweight, body-mapped races vest features an improved fit, run-proven pocketing, and the new two large Soft Flasks. Equipped with two 20oz soft flasks with extended tubes to easily sip fluids without removing flasks from the front pockets Apparel-like fit with a lightweight, breathable structure Large front-stash pockets for quick access to on-the-go essentials Zippered water-resistant chest pocket for smartphones Zippered water-resistant pocket on back, for securing key essentials Shoulder pill pocket and safety whistle Reflective hits for 360-degree visibility Compatible with 1.5L Bladder Storage Capacity: 244 cu in/4 Liters Weight without Soft Flasks: 6.3 oz/178 g Weight with Soft Flasks: 10 oz/277 g