Toting your empty suitcases down to your empty trunk to see how and how much will fit, before you begin to pack.

Because I don’t want to be the guy parked next to the trash, unpacking a suitcase and alternately dropping stuff into the trash and through the mostly rolled-up windows of the car, just to make it all fit. Even though I’m not likely to be fat, wearing suspenders and thus resembling a clown.

Bonus: opportunity to discover that your popcorn tire is way underinflated!