HAD we been in the car for a trip today though, you can bet we'd have some games packed and ready to go. The portable Magnetic Games from The Purple Cow are always a good bet. They're small enough to slip in the back pocket of the car seats, and extremely portable. Everyone likes a good game of Tic Tac Toe or 4 in a Row. Even the grown kids will play if they're in the back seat with little man (who's not really so little anymore).
The easy to open and close tin has a game on each side, each of which have magnetic pieces that sturdily stay put and easily come off when you want them to, included.