I bought a second bag for my new gravel bike after having one on my road bike for the last two years/12,000 miles or so. It's large enough to carry more stuff than I probably should and small enough to tuck under the seat without rubbing my legs or bugging me. The clip in system works well and has NEVER come loose accidentally. Even when bouncing around on some (tame) singletrack on the new Gravel ride, the bag was perfectly secure.
