ULTIMATE DIRECTION MOUNTAIN VEST This is a trail running pack. Would it be suitable for trail running races of 50-100km? L size. It's a lightweight trail running pack with multiple pockets. Thank you for viewing. Chest size: M / 76-99cm * Capacity: 13.27L * Weight: Approximately 325g Numerous front pockets. Drink holders, one on each shoulder. The loops for the bungee cord were fraying, so I added and resewed custom-made loops. I also sewed loops on the sides of the shoulders so poles can be attached. If you don't like the color of the loops, you can color them with a marker to make them darker, which should solve the problem.