Mustard
Similar to ketchup, mustard can also last longer if it is outside of the refrigerator. Mustard has a natural acid which acts as a preservative. This is why mustard can be stored even longer than ketchup.
Soy Sauce
Did you know that soy sauce stays edible for roughly a year and six months? It sounds like quite some but it is a fact that soy sauce can do exactly that in the pantry. You should know, however, that storing it for that long may change its taste, but it will be fine.