I tend to wear a 'shoulder strap' bag, im not sure what to call it, but it's handy when travelling, got room for; DS, Book, basicsmall first aid kit, notebook, food and whatever else I bung in their before travelling anywhere XD
I wouldnt go as far as calling it a purse because its just a shoulder bag! Its quite stylish too, (at the risk of sounding slightly camp lol) I have my own little fashoin sense which depends on colours not brand names and this really fits with most things because its sort of an old washed out browny colour XD