Pencil case (including pens, pencils, erasers, coloured pens, highlighters), pre-holepunched notepad, small ringbinder (for storing notes in), lecture handouts (we get them given to us at the start of each lecture series - although some universities require you to print them off yourself), snacks, some supervision work (to do in the awkward hour gap between lectures when I can't be bothered to cycle back home. Admittedly occasionally done during lectures if they're really boring...), money (to buy coffee), flask (if I can be bothered to make coffee/ hot chocolate in advance, which is very rare since I would have to wake up 5 minutes earlier...), water bottle.