We are great fans of travel games in our household, they literally travel the world with us.
I'm not saying that the original casing for pass the pigs is enormous but when you are only taking a messenger sized bag for a week away every inch counts.
The system we run with is to use my custom printed scorecards (see download link below) and simply carry the pigs around in an old camera battery case. There are many more scorecards than you'll need on one trip on just a couple of sheets, and as you can see from the picture, ours are plenty stained and dog-eared.
Be sure to check back regularly for my next must have travel game.