Put belts in your shirt necks
If your vacation plans include a few occasions where you need to be smartly dressed, or your off on a work trip rather than a holiday, then this hack will be pretty useful. Keeping button-down shirts square, smooth, and wrinkle-free can be difficult, and no one wants to turn up at an interview looking ruffled.
The solution is easy. First, fold your shirt as it would be in a store: nice and square. Then roll your belt and fit it into the collar of the shirt, where your neck would go. This will keep the collar stiff and upright, and your outfit ready for anything.