Airmesh belt is breathable and soft to provide great comfort while your bag rests on your help * Airvent comfort. Comfortable and breathable back system with 3D mesh pads separated by channels for easy air circulation. Zipped belt pocket * 4D Bottle Holder is inclined 45 degrees for easier access when running. Top of the bottle is shaped to make it more instinctive to put the bottle back * 1-3D Bottles included (20 oz). More ergonomic than classic bottles * Reflective patch. Weight 5oz