Great little bag! I use it to carry a tool kit and a few spare parts. It's roll up top with buckles does a good job keeping water out. I do wish it mounted a little more securely but I haven't had any issues with it moving around or shifting even on rough trails. The directions aren't great but it's not difficult at all to figure out how it mounts. It's so simple it made me over think the instructions. You get what you pay for, I'd buy it again.