Instead of having an empty suitcase in your closet, pack your suitcase as if you were going on a trip, with some extra clothes, bath kit, and some cash.
In case of a family, medical, or natural disaster emergency, you can grab-and-go on a minute's notice.
For example, if you had a family emergency out of town, you could grab your emergency suitcase and be on your way.
It also helps to know your blood type, in case a family member/friend needs a blood transfusion.