I have had a medium sized timbuk2 that has the computer pocket for about 3 years. It is built very well and still looks as good today as it did three years ago. I have no problem with the straps, but I use mine almost only for the computer and school things. I'd say this bag isn't very big; with computer I can only hold 2-3 books, and I would think putting a 6 pack in there would be tough. But for what it is it is great.
I actually just ordered one of kemmer's bags for the times when I need to move more stuff..