Just having a scout through mine and this is what I have (and use daily) in mine:
6 nappies
Boots nappy sacks
Zinc and Castor oil cream
Sudocream
Pampers sensitive wipes
Cotton wool
Baby lotion
2 changes of clothes for baby (day and night) - top, trousers, vest, socks
2 bibs
1 muzzie
A measurement of 6oz of formula in a container
Milton wipes
Milton tablets
Milton handwash
Top to toe wash (Molly has a habit of having explosive nappies at people's houses and we need to bathe her
The bag contains a travel changing mat. I also have hand cream (always have some in your bag!), purse, keys, pen and phone in the front pockets.