The Tire Bag 2, with its rectangular main pocket and two zippered side pockets, is an excellent option for road or mountain bikers who need extra room. Originally designed to hold 2 sew up tires, the tire bag has crossed over to the main stream. Hook and loop at the seat post, and 3/4″ nylon strap long enough to secure a light jacket, provide an extremely stable mounting system. Features: Can be mounted on the frame or under the saddle Designed to hold a tubular tire and tools, perfect to carry longer or larger tools