I love the Lowepro Pro Roller carryons. The one I have has a open-ended pocket which lets me put a laptop or iPad into the carryon quickly. This pocket is elastic, and holds the laptop and other flat items pretty securely. The only problem is that the top is open -- there's no strap or way to close up that open end. I was boarding a plane, swung my Pro Roller up into the overhead bin -- and wham! my MacBook Pro dropped out of the carryon, landing like a brick.
I opened it up in a panic to make sure it was still working. It seemed to be fine. It's two weeks later, and I am using it as usual. I hope that I am not jinxing it now that I am writing this. Thanks Apple for making a great product (and for the hard drive sensor thing, which I assumed saved my hard drive).