My wallet usually has my student card, money (currently £2, with £1.33 in the bank. Oh yes!), debit card, blood donor card, DST and DST tech (Durham student theatre) cards, driving licence, sometimes my Swisscard. it can get too fat to fit comfortably in my pocket so I often switch a few basics into some form of small plastic wallet - this has been my railcard holder and a different plastic card holder thing. The railcard holder is superior as I don't have to use tape to hold the money in!