Sheathe Your Razor Blades
If you use single-user razor blades exclusively, you can skip this item since you can pick up a cheap pack at a convenience store in the destination country. If you have your own set of reliable blades, make sure you cover them up carefully. One loose razor blade can tear all your clothing to shreds in the suitcase.
If you don’t have the original package, you can use binder clips to sheathe the razors. Also, consider using a few rubber bands to keep the binder clips in place. Finally, don’t keep razor blades in your carry-on since they’ll get confiscated.