We always keep stuff in the boot that we might need (lucky we have underfloor storage for most of it):

- a picnic rug
- a swimming bag with togs, a spare change of clothes for each of the kids (including a jumper), towels (we live in NQ and we have often found ourselves out somewhere and the kids want to swim or get muddy/dirty/sandy - it takes the stress out of it for me)
- Umbrellas and raincoats for the kids
- A bag of sandplay toys like trucks, buckets, spades
-First aid kit

I never leave the house without packing the nappy bag with snacks, a drink bottle for each of the kids, insect repellant & suncream (again NQ ), a spare change of clothes. The few times we have ever left the house without properly packing the nappy bag, we have lived to regret it so now we keep it packed all the time (we repack it as soon as we get home) so we can just grab it on our way out the door without thinking about it.

I also keep the kids shoes in the car - so much easier to take them off there then to have to run around the house trying to find two shoes for each of them before leaving home.