The Chest Pocket / NDM 2 is the optimal attachment for the person that wants access either soft or hard sport bottles without having to open a pocket or take off the backpack. The attachment can be used on the No Dancing Monkey 2.0 and No Dancing Monkey 2.1 harnesses and is simply attached by 4 plastic clips. The pocket is approximately 17cm / 6.7in in height and 8cm / 3.2in in width.