I'm not saying Topo is bad, just I haven't heard of them. Last trek I did was in Nepal last November but I haven't really followed the gear stuff in a while. Dana Design should be almost impossible to find since they weren't that big to start with but once the new Macbook Air comes out I'll finally be able to use that pack again. Damn heavy and huge 16' laptops.
I apologize if what I wrote came off as rude, I didn't mean it to sound that way