I have:
2-3 nappies
Wipes
Ziplock bag to put pooey nappy/clothes in (learnt the hard way when i forgot to take a pooed on top out and stunk the house out when it was only in a nappy sack)
Nappy sacks
Spare dummy
Spare top for me (reflux baby)
spare top, pants, beanie and socks for baby
tissues
2 teatowels for spit rags/chuck rags
2 bottles
formula dispenser
wallet
keys
phone
Beach towel (my changemat because I'm too lazy to get one and they dry super fast)

AndI just figured out why my back goes out of whack