umm...thinking back that far! lol

About 8 nappies (depending on how long the trip is
Wipes
Wetbag
at least 2 changes of clothes (been caught out with only 1 before lol)
A flat for spew rag
A little puch that has a singlet, pants and sock in it that just stays there JIC
NR cream, fes, panadol, etc that stays in there JIC
2 rugs - 1 for her and 1 for the car window if needed
Teddy or toy
Water bottle for me
sometimes a trolley cover
hat

It just depends on where you are going and for how long. basically though, lots of nappies, spare clothes and lots of wipes!!
I know I used to and a few other girls here do the same thing, was to keep a spare nappy bag in the car permantly for occasions where you forget the bag or are jsut going out quickly - just a few nappies, a change of cloths and a little pack of wipes.

My bag wasnt huge, but I found that packing it properly made a HUGE difference to how much stuff we could get in it lol