I use this on my cross bike that I use for gravel riding. It works just fine. Fits a 700x35 tube, my tire levers, and a multi-tool no problem. I've been using this for the past four months with no issues. Secures nicely on my saddle & seat post with little movement.
Looking at the other reviews, it looks like some people are having issues with the Velcro. I haven't had the issue with mine.