How about a toothbrush?
I carry a very small purse with the idea that when one of the kids ask me to carry something I can tell them, "No. There's no room."
In my pockets, however, I make sure that I carry eight pony tail holders all summer long.
I try to keep everything I need in my purse without any extras. I always have a brush, identification, a check book, a pen, an emergency supply of feminine hygeine, lipstick, foundation, rouge, and a small scissors. Rarely is there cash, but that isn't because of space limitations.
But I never leave home without a toothbrush. I just hate to get food inside my horn...
Elisabeth
PS MIL always carried a roll of toilet paper.