Sanity saver of the week

Well, I'm a few days late but I couldn't possibly not give a sanity saver of the week...I mean, I'm on a roll!;)
This is something I am sure a lot of other moms do out there, and let me just say, there have been a few times this tip really has saved my sanity!

I despise being out somewhere and discovering that I either
A) Forgot the diaper bag
B) do not have what I need in the diaper bag
C)Have the bag, have what I need IN the bag, however a sippy cup has spilled on the diapers and they are destroyed... (You get the idea)

So, I created a bag for each of our cars and the bag never leaves the car. I keep it in the very back and the kids can't get to it to pull things out, and I always know right where it is. In this bag I have the following...

*One outfit for each of my kids (Underwear included for the girls because when you are fully trained by 2 you may still have an accident when your well lets just say, at the park;))
*Diapers
*Wipes
*Bottled water
*Snacks that wont melt (I have some of those pb and cheddar cracker packs)
*A few wash cloths
*Sunscreen
*Sanitizing wipes
*A shirt for myself
*Some hair ties (A MUST with girls)
*A few books in case the girls need something to occupy them.

I think there are a few other things but I'm not sure. Like I said, I know a lot of other moms probably do this too. There have been a few times it has come so in handy because we wouldn't realize the wipes in the diaper bag were empty. Or we wouldn't remember water for Caiden's bottle or we just plain would be in such a hurry and think it was going to be a quick trip and wouldn't grab the diaper bag, then when we ended up out longer we needed a diaper....Poop happens:)

If you are a mom that does this too, I would love more tips on things you keep in your bags that come in handy!!