The bag seems well made. So far I've only had a chance to install it, which proved to be quite easy. I haven't ridden with it on the bike yet.
The only glitch was figuring out which screws to put in which holes when screwing the mounting hardware to the bike. My BMW G310 GS wasn't mentioned in the instructions, so I tried following the instructions for "other bikes". That proved to be unhelpful, so I just looked at the screws, looked at my bike, and figured out which screws would work where. It was easy.
I already own Rhinowalk pannier bags and a top bag. They have served me well, so I expect the same from this tank bag.
