I always have my handbag! I even took it on a driving lesson the other day, which made even me go
but then I did need my glasses, diary to book the next lesson, purse to pay the instructor, keys and phone so I by the time I take all that out, I may as well take the whole bag!
I always carry diary, glasses, sunglasses, phone, ipod, keys, mirror, far too many different types of lip balm/gloss, handcream, reusable shopping bag, tampons/towels, hand wipes, hand gel, bus pass for me, bus pass for DS, work pass, painkillers, Rennies, plasters, tissues, several pens, several boxes of TicTacs, gum, emery board, suncream, small notebook.
I am the person that everyone at work comes to if they need a painkiller or emery board etc as they know I am well stocked. It's no wonder that I usually have a bad back though...