What if its just bad use? I have some nice Targus model that I actually bought a second one because the zippers were opening. To my surprise, in a few weeks I got my first instance of zippers opening. Of course, I was overstuffing a bit at the top. I remembered that I had removed some guards that transform this model from more like a regular backpack to a clamshell. Maybe that is a very important feature I have to use, or the zippers will fail, when you carry a basketball there...