Use a flat iron
Not so much a packing hack, as a great hack for when you get to your destination. Sure, some hotels and rentals do provide irons and ironing boards, but not all of them do. If you’ve unpacked your case and realized that your packing wasn’t quite as neat as you’d hoped, then you’ll need a way to deal with all of those creases.
Thankfully, you’ve probably already got something in your case which will do the trick in an emergency. Your flat iron isn’t just great for your hair, you can also use it to iron out the creases in your shirt or dress. You can do it anywhere there’s a socket, and you’ll look fresh as a daisy.