The reason the vacuum sealing system’s up on this list is because I feel food has a much longer “shelf life” so to speak when its vacuum sealed before being thrown in the freezer. Used to have a lot of power outages when we lived in Toronto, and each time our food would thaw out a little it’d taste worse and worse – except for the one vacuum sealed slab of meat we got from a neighbour which I think withstood 2-3 power outages (one which lasted 4-5 days) and tasted as though it was vacuum packed the day before. I’ve also heard of people vacuum packing rice into smaller one-serving portions, and have always thought that a great idea for cases you might want to throw a bunch into a pack and go, or just generally extend the shelf life of your food/prevent rats and mice from getting into things. Necessary? No. Definitely still something I want, though.
Freeze-dried food is nothing new. As early as the 13th century, the ancient Quechua and Aymara people of Bolivia and Peru pioneered a form of the process by exposing potatoes to the freezing temperatures of the Andes overnight, then drying them in the sun. In 1937, Nestlé used industrial technology to create the world’s first freeze-dried coffee, and in the 60s and 70s, the US military shipped freeze-dried food rations to the troops in Vietnam.
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