I need to transport my laptop nearly every day. I tried panniers, but for the laptop I ended-up with an inexpensive SIMS messenger bag I found on close-out at either Dick's or Sports Authority. This allowed me to keep the Topeak MTB trunk with retractable side panniers for the rest of the cargo duties (tools, spare tube, lock, lights, lunch, work clothes, etc.). I like the load placement better with this set-up plus the laptop doesn't seem to get jostled as much.