This tailbag is one of the best motorcycle bags I have ever seen and used. The thing is just amazingly versatile. It's got a lot of storage, comes with bungee hooks to attach it, comes with it's own rain cover (tried and tested), has some reflective piping on it, it holds its shape in the wind and turbulance and it's nice and aerodynamic. I love this tailbag! By the way there is a nice tailbag thread on Apriliaforum.com that has all sorts of different bags and opinions on it as well: Apriliaforum tailbag reviews/ pics.
Cortech tailbag nice and snug on the APrilia Mille. It actually lessens the buffeting on my by quite a bit when I put it on the back.

Cortech Tailpack on the Vstrom 650:
