Without getting into the "bring it / leave it at work" debate, for more than a year I've been commuting with my laptop. It measures15 x 10 x 1.5, and I carry it in a neoprene sleeve, within an Ortlieb Back-roller Classic, with an additional storage bag that contains all my laptop accessories. I've replaced the neoprene sleeve once, due to the wear and tear it takes inside the pannier, rubbing against mounting hardware. Other than that, it has worked really well. Prior to that, I was using a messenger bag or backpack, but opted for panniers again due to the "pain it the back" and the heat.