Agree with previous posters, but could also do some classic stuff.
A couple of Mad Lib books and some cool mechanical pencils, a nicer set of coloured pencils or markers, pack of Uno cards, a classicy game they may not have - I saw mastermind is back, it was $10 at Target I think it was the other day. Other classic games in travel form - Connect Four has a zip-up pouch version, small wooden chess set, etc.