Champion ultra runner and renowned minimalist Rob Krar collaborated once more for the updated design of this popular, lightweight and durable race vest. Includes a 1.6L Insulated hydration bladder, with an hourglass design to reduce sloshing Insulated bladder keep water cooler 38% longer than non-insulated flasks Apparel-like fit with a lightweight, breathable structure Internal compression system tightens the load against your back for stability Zippered water-resistant chest pocket for smartphones Large front stash pockets for quick access to on-the go nutrition and essentials Back kangaroo pocket for stashing flasks, layers, and other essentials Zippered pocket plus two large storage pockets on back Shoulder pill pocket and safety whistle Reflective hits for 360-degree visibilityStorage Capacity: 732 cu in/12 LitersWeight With Bladder: 15 oz/422 g