I'm looking for a schoolbag and purse for high school, and I was wondering what kind to get.?

I'm going into a private high school next year, so I feel kind of intimidated as to the quality of my stuff. I'd like something with good quality (but that my stingy parents would allow) at the same time. I'm definitely leaning toward a comfortable tote bag, and I'd like it to have a cute design or a funny phrase. (It'd be nice if it supported a good cause, but it really doesn't matter.) I do NOT want a preppy bag -everyone has those. I'm on the nerdy side, I admit, but the cool nerdy side if such a thing exists. The bag must also be big enough for my laptop, which is around 15 inches. I like conversational pieces as I'm rather shy and can't think of topics without someone speaking to me first. I would like a purse for the essentials, but it's not really important. Again, I would prefer affordable, high quality, and cute, but not preppy or trashy. (A small to medium sized purse with pockets and zippers that is easy to use would be best.) Thank you for your help on this matter.