I'm all for color! I think if you like carrying it and feel like it looks good, then why not?
I colored my hair last week, and I had it cut. Both needed to be done, and I was stunned how different I felt when I had a more streamlined haircut and good color. While I know appearances are not everything and looks are not everything, feeling good about how we look gives us confidence in other areas. If this bag is lovely, affordable, and gives you a boost, then don't let the pink stop you. If you will be self conscious, then don't buy it.