I bought the micro.
The zipper on this thing sucks. The 1st one broke as soon as I packed it and tried to close it. I took it back and got another. The 2nd nearly did the same thing, but since I'm no dumby I learned my lesson. You have to be on top of your game while zipping this thing. You can't just casually zip it up (while it is full). It will get off track every time.
Anyway, once I got it figured out I was able to get it VERY secure to my bike. It has 1 tube and 2 levers in it. Don't think it will hold much more. I like it now that it's on my bike!