I always pack at least 8 nappies plus wipes, bunny rug, dummy, change of clothes, 2 bibs, nappy sacks and at least 2 bottles of cooled boiled water and formula in a separate container for making up feeds. I always pack one more bottle than I think I will need, in case on gets spilt or something.
The nappy bag also usually doubles as my hand bag so it has my purse and phone in there as well and if I am taking both kids out, a couple of nappies and a drink/snack for Harry.
As Grace gets older it will also hold toys, teething stuff and probably a jar of baby food aswell!

Bon