I am no expert in packs , so I cannot recommend any particular model or brand. But here is something to consider.

Weight and dimensions are critical in your situation. Comfort is a priority. Extra padding goes without saying. Not only it is essentail for carrying the pack comfortably, it may help you improvise a cushion/pillow if you need extra rest while waiting or travelling in the bus/metro.

Color ? Well, like others said : you know your situation better than any of us. In my neck of the woods, only Camo is seen as "tactical", while coyote brown is seen as CAMPING stuff, and black (luggage color) is seen as neutral color with no meaning (but considered elegant in the female fashion world) !!

It is different from area to area.
And you know your area better.