I commute to school, work, wherever. I have stuff that I need to carry, mainly books and binders. So far I've been using this: http://www.bontrager.com/model/08102. I used the model below this (with the draw string) but it broke off. Now this one had the same problem tonight on my ride home. The clasping mechanism is great but the point of attachment to the bag isn't. It flat out ripped off the bag. Now here's how great the mechanism is: the other clasp was still attached to the bag. Basically I was hauling about 30lbs on it and hit a bump and snap went the bracket on the back of the bag holding the clasps to the bag.

Any recommendations for a better bag? I know, I'll get two so the weight is distributed. Also something that I can carry around easily enough. I need to take the stuff in my pannier(s) with me. The handles on my previous one were not that comfy.