I've got that bag hanging from my champion flyer (sprung B17), and like it a LOT. The leather bottom of it is extemely heavy duty: nearly as thick as the brooks saddle, but more supple. It comes with 3 leather straps with brass buckles that go thru D rings on the bag, two go through your saddle loops, and one atround the seatpost. It holds a lot. The closures are a little tough at first, but relax with age. Compared to a lot of wedge bags and small saddle bags I've tried, I feel this one's a winner, and for the first time in a long time, I don't feel like I need to look for anything better.