I use the Topeak Trunk, that slides and snaps into place on it's rack. It has the expandable panniers as well. For the laptop, I just carry that in a small padded back pack, but then again, my commute is only 4.5 miles. When I was commuting 11 miles one way, there were a few times I would put the LT in a side pannier, but I was always very nervous about that, so I started to use the back pack. I have also just the laptop bag itself, worn like a messenger bag. If my load is real small (just a sandwich and snacks) I just stuff them into my jersey pockets.