Comment National Geographic Earth Explorer (Score 1) 282
National Geographic sells the Earth Explorer series. Durable hemp canvas and plenty of padding; sew a patch over the National Geographic logo for stealth (or don't; looking like an NG photographer may be a pro or a con depending on where you're traveling).
I've got the medium, and use it extensively for traveling (albeit not with camera gear), and I'm more than impressed with the quality. I've visited three different continents with it as my only pack, and would buy it again in a heartbeat.
Keep in mind that NG apparently measures laptops differently than everyone else; it would be wise to try fitting your laptop into the bag before purchasing.