Does sea salt need to be vacuum sealed for long term storage or can I leave it in its packaging? Same question as above but for granulated sugar. From what I remember cooking oils like Olive Oil and Peanut Oil all have practically indefinite shelf lives. Can I leave in bottle they came in or do they need to be sealed another way to keep that long? How long will something like Krusteaze buttermilk mix or biscuick last if it is sealed in a mylar bag with O2 absorbers?