I wonder if there is anything close to being overly prepared? I carry with me nearly a complete office in my vehicle. Of course my laptop and hard copies of purchase and listing contracts as well as pens and notebooks. Additionally, I have my lawn chairs, tool box, signs and a cooler for drinks on the go. Non alcoholic beverages of course! There is still a little room to stash my gym bag in the eventful moment I may squeeze that stop in as well! Whew! No doubt I am forgetting something but I try to be prepared! I have business cards in my purse so......am I missing anything?