Whether you are traveling by plane, train, or automobile. Or ship. You know, you really need similar things. So anyway. Here's the checklist I always make sure I have. (This is aside from what I pack, just what I keep in my purse.)
Phone/iPod +headphones/earbuds+ really awesome music+or books and movies. (Or an entire season of your favorite show, whatever works. )
Touch up makeup products.
Dramamine + ginger ale + ginger snaps ( if you're prone to motion sickness, sea sickness, ect...
Cozy sweater. Why does traveling = cold?
Outfit that looks cute but isn't actually much beyond sweats. Aka, legging and long top. Or stretchy shorts, depending on the season.