I recently returned from an almost 1,900 mile off/on road trip into the mountains in Colorado and Utah and the deserts of Arizona. The terrain was very rough at times with large rocks causing lots of shaking of the bags. I installed a set of side racks for supporting the bags which I think greatly contributed to the success of the these bags. I had the bags very heavily loaded with tools, spare tire tubes, and other misc supplies. I was very impressed with the quality of the zippers on the bags and the seams in general. I also liked the included hi-viz rain covers which worked like a champ at highway speeds and added a some additional visibility. The only negative thing I noticed about these bags was the layout of the securing straps. There did not seem to be a good way to utilize them on a bike where you don't want to run the straps over the back tire. I made it work by strapping it to my racks but it still could have been better. Overall, excellent product for the price.