The Challenge Tool Bag is for fitment to the rear of a saddle bearing bag loops. It featured buckles that whilst fastening the bag to the saddle, are located within the hold itself, thus ensuring greater levels of security and the strap that secures the unit encircles the tools it carries, to prevent them from rattling during transit.
This is easilly the best saddle bag out. I ride a brooks saddle because its comfy and this is the only bag to hang under it. They are spendy but do look great and will last a lifetime