Re: Mama's of only's or only's for now who are PT or close to it...
I use a reusable shopping bag i got from the Disney store. I keep a change of clothes, wipes, snacks, juice (to refill sippy), and whatever else my son has "packed" before we Left the house.
I keep it in the car in case i need whats in it. Other wise I take what I need from that bag and put it in my purse for quick trips in the store.