If all I need is money, music, and writing utensils (or other comprably small things), I just shove everything in my cargo pockets. If I have no cargo pockets, I will sometimes carry smaller belongings in a small blue bag with a cool-looking mandala on it. If it's a day where I happen to be making an actual, concerted effort to pass as a guy AND I don't have cargo pockets, well... I'm up a creek without a paddle. XD (That happens every time I have field experience, because my "teacher pants" have really sorry excuses for pockets, and teaching is one of those places where "I'm a guy" goes over better than "Uh, I'm a something. You can call me anything but she.")
If I have a bigger load, I generally just throw everything in my backpack (with is, well... a backpack). Or on rare in-between occassions when all I have is a sketchbook or notepad or something, I have a hemp messenger bag covered in various witty buttons I've collected over time.
I have all my bases covered. 8D (My various bags/carrying compartments are clearly intended more for function than fashion. They look cool, but that is not their primary purpose in life. If you find me carrying a bag that matches my outfit, you can bet your butt it was a complete fluke!)