The North Face Summit Run Training Pack 12 L Vest is perfect for marathon runners, hikers, and a slew of other outdoor adventurers who need a reliable roomy pack. This vest is made of breathable nylon fabric with built-in 360-degree reflectivity so you stand out in low light conditions. It features layered pockets so you can store an abundance of personal essentials, including a secure zipper phone and a back pocket for your phone and other medium-sized items. The harness is minimalist in design, easy to use, and can be adjusted to your fit. A whistle and two custom 500-ml soft flasks are included so you stay hydrated and safe during your journeys. The North Face Summit Run Training Pack 12 L Vest is the best way for you to enjoy all of your outdoor adventures all season long!