Depending on whether I'm going to uni or just going out for other stuff I have either a bag or just a small purse, but I always have my phone, wallet, keys, some tissues, and some meds in case of headaches. In my bag I also fit books and notebooks for whatever lessons I'm going to, a pencil case with a dozen pens and pencils, a bottle of water, a small umbrella, my iPod with earphones, a charger, and if I know I'm going to have spare time I'm not using for studying things, any book i'm reading.