I always have my cigars, ligter and cutter with me. I almost alway have my car charger for my iPhone with me and I usually have my Kindle as well.
My car always has a stash of water and protein bars, a blanket or two and some hats and gloves, so I'm good to go
(I carry all this because one time we were coming back from central Oregon the week after labor day and got stuck going over pass through Mount Hood by an unexpected snow storm. Stuck for hours with an infant... what a drag that was!)