I was musing about a briefcase that would look "low profile" enough for urban/office environments but that would also provide maximum utility in a bad situation. The image in my mind was the masses of office workers walking home last year in New York (or was it 2 years ago?). Such a bag would be for the kind of items you want to have but can't wear on your person (2nd-line vs. 1st-line gear).

I envisioned a practical, organized carrying bag that could fly under the radar as a reasonably appropriate business case, which kind of rules out the Maxpedition type packs. I think that a backpack mode would be really useful if you were spending some time on foot while evacuating. It would free up your hands without a shoulder strap being slung around your neck.

I found the following 2 bags that look like computer cases but have hide-able shoulder straps. I'm linking to ebags.com because they have good pics & info.

Patagonia One-Bag : I have one of these on order and will see how it works out. It seems to have a lot of room.

Camelbak Field Case : I would love to see more of this bag but I can't find any other pics on the web. It looks like it has more organizing options than the Patagonia bag.

Both units have carrying slots for a laptop which I think enhances their daily usefullness.

There are plenty of good backpack-style computer cases on the market but they still look like backpacks, which is too casual for some environments. The above bags may be an option for some.