I'll play!
I carry two wallets
In the first (the main one, it's a smallish coin purse) I have: my driving license in the outer pocket (so I can show my ID easily and always find it), Co-op card, credit card, Nectar card, debit card, uni coffee shop stamp card, NUS card, pasty shop stamp card, Waterstones card, Waterstones stamp card, Waterstones cafe stamp card, myWaitrose card, SU Starbucks stamp card, M&S vouchers, Active Kids voucher, Paperchase card, La Tasca card, Love2Shop voucher, Waitrose giftcard, Boots card, a couple of receipts and coupons, and 10.25 in cash
In the second (basic coin purse) Ihave overflow cards and stamps etc.
And I have a pass case thing in my coat pocket with uni ID, bus pass, Oyster card, and McDonald's vouchers in