In parakkum's photo above you can see a shot of honeyfields and I walking the convention floor, which is deceptively clear of traffic. You can see honeyfields with Timbuk2 bag and me with backpack, poster tube, and camera strap. Next year I may switch to a setup more similar to honeyfields. The camera strap will stay but the poster tube and backpack will probably go. A backpack is hard to get access to, especially with poster tube and camera strap wrapped around your neck. You end up having to memorize an intricate order of strap removal in order to avoid strangling tangling. I've previously carried a Chrome messenger bag, which is a better than a backpack for breaking out the sketchbook, though mine is too big to easily swing around from my back to my front. I've wanted to get a medium-sized messenger bag for cycling, so now I will shop with Comic-Con also in mind.