This bag is exactly what I wanted, in pretty near exactly the dimensions to fit my back seat. The installation is straightforward and the quality of the bag itself is absolutely top notch. The rain cover is sturdy and the lid of the bag holds its shape, forming an additional cargo compartment all its own. It expands quite a bit and is a perfect complement to my sportbike's tank bag.The only down side of this bag - for me - is the quick release clips on the side. That means I can't leave this bag unattended anywhere...any rando can walk by, unclip it in seconds, and walk away with it. The best I can do is perhaps try to run a cable lock through it. There's a sturdy D-ring on the front and the handle on the back which could accommodate the cable. I'd have preferred that the bag would just attach securely to the seat and that's it, but I understand there are probably plenty of folks who would like to be able to detach it easily. Too bad there aren't two versions! But I'm really glad I bought this one.One bonus is the rain cover - it conceals the quick release clips on the sides. So if you need to leave the bike unattended for a short period, like to run into a gas station or grab some food, that's a good option.