I own the 15inch vinyl Incase sleeve and if there's any criticism I have of their product it's the cheap zipper and the the way it's joined to the rest of the bag that makes it look unprofessional. If you take a look at other bags you'll see they have a beefier zipper. Take a look at the Marware sleeves for instance. I haven't had any problems with my zip but I suspect it'll be the first part of the bag to break.