Memory is the first thing to.....um.......what was that again?

I am astonished at the number of times I have driven away from my home without my driver's license! For whatever reason, I'm much better at making sure I have my cell phone with me. What can I do to make sure I don't forget my purse? Attach a battery powered blinking light? Nah, I can't ever find the right size batteries I need anyhow. I guess I could duct tape my phone to the front of my purse? Yikes! Now I'm thinking like a man! I believe this comes from watching too much of the Red Green Show with the hubs. What I need, they haven't invented yet. I need a magical bag like that of Hermione Granger's from the Harry Potter books. A tiny bag that holds my entire life! But I need the bag to be small enough to fit in my pocket. About the size of a pack of Tic Tacs would be great!