9. Carry Backup
Certain things cause disappointment if they are lost, others cause all out disaster. If you can, pack a backup of disaster-inducing items on the chance that the first one goes missing. Examples might include car keys, small kids’ loveys, and park tickets. (My son once lost his Magic Band on Thunder Mountain, but thankfully we averted disaster because we were carrying his ticket card as a backup.) Obviously, keep the backup and the original in two different bags/places.