I love the optic white too but I've seen so many bags with color transfer that I couldn't buy one. I do have several color bloc bags with white stripe in the middle and they are fine. I am extra careful with them.
I do! I have the Greenwich bucket bag in optic white and I have had no issues carrying it. I am conscious of color transfer, and I wear darker denim sometimes, I am careful when I wear the two together, but I wear it for several days in a row, sometimes all week and it has been perfectly fine.