Very fast and easy to assemble, the system scratch is really solid and not let the bag to walk under it. The advantage of this system is that it is not likely to break when dropped to the inverse of a plastic mount. Contrary to what I thought no overhang behind the saddle. The pack is quite large, I was able to fit a mountain bike inner tube, pack patches + minutes a leatherman multifunction pliers-type bike, my bars for small snack mid hiking and I should have enough room yet to come home to a puncture bomb I do not prefer to use for the well being of my room air. I am fully satisfied with this product and would highly recommend it.
