I usually look at the colors that the university (college) kids have for their
backpacks and go with something similar. That's pretty safe.
I could have sworn I posted on this thread earlier? Anyway, I agree look at what people carry black is a very common if not the most common backpack color. If you look around a college campus you see alot of black, blue and green.
Another thing I notice is people carrying backpacks in stores. At school it didn't seem out of place but in the mall I always wonder what the person is about to steal <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />.
Personaly, I don't think 9 out of 10 people know what PALS webbing is or care. If you know tactical you just know; it is a different crowd. Black hides some stains better than tan but in dusty West Texas tan shows less dirt. It also doesn't get as hot in the sun.
I opted for tan is my TAD Gear dispatch bag.