Yeah, I don't know what goes with a mountain bike although I tend to think that any basket goes with any bike if it has pink flowers around the edge:-), which you have to add yourself. And it looks like your bike has a straight handle bar. I love that this also works as a shopping basket. Used mine at the farm market all the time.

Also, I checked out storage stuff for Big's bike last year and I like the saddle bags option. You need to install a rack and then the bags:

http://www.amazon.com/s/?ie=UTF8&keywords=bicycle+saddle+bags&tag=googhydr-20&index=aps&hvadid=1695457361&ref=pd_sl_9k4cgxkcjd_b