Here's a couple more shots so you can see a few more details.
You might also note a lack of exterior pouches. There is one on the front (which I plan to use for a phone charger and spare battery) and a side pocket for a water bottle, but that's it. Although multiple pouches was an idea I originally looked for as well, I've also since overhauled my wardrobe and most of my clothes have plenty of pockets for the smaller items I had earlier thought I would need pouches for (business cards, primarily).
The shoulder clips are separate from the fold-over top, so I can still sling the bag over my shoulder with the top open. Plus it has two magnetic clasps on the inside lip to keep the bag shut in those instances.
Now, here's where I start a little customization. See the four D-rings on the back? Those are if you want to use the bag as a backpack. (It comes with two straps, but I'm only showing one in these pictures.) My thought was that I could use those to hang an art carrier from. Commerical portfolios tend to be lager and ill-suited to this, so I basically made my own...
(Minor side note: I went ahead and got a permanent water bottle to go with this too. I don't want to just use plastic disposable ones, and the thermos-like shell on this one should prevent it from sweating. Also, in a pinch, I can hang the bottle from a clip or strap if I need the side pouch to carry something else.)
So far I've only tested the bag at a comic shop signing, not a full comic convention, but it does seem to hit all the points I've looked for in the past. I'm looking forward to taking this out in the field, and seeing how well it holds up under real-world conditions. I think I'm all set for the 2015 convention circuit, and it's just a matter of seeing what my time/budget look like to see which shows I can attend.