Vacuum-packed describes food (and sometimes other goods) sealed in a bag or box with the air sucked out first. Without air, the food goes bad much more slowly, so it keeps longer and can travel further.

You see it on labels in supermarkets: vacuum-packed coffee, vacuum-packed beef, vacuum-packed fish. The bag is usually pulled tight around the food, so it looks squeezed — that tight, shrink-wrapped look is the sign.

It is an adjective and it normally sits before the noun (vacuum-packed rice) or after "be" (the meat is vacuum-packed). English also uses the plain verb: they vacuum-pack the coffee before shipping it. Both are ordinary, everyday words here — this is not a formal or literary term, it is packaging language.

Though actually — the air is never all removed, only most of it. And vacuum-packing slows spoiling; it does not stop it. Vacuum-packed food still has a date on it, and once you open the bag it behaves like any other food and must go in the fridge.

British writers usually hyphenate it. American writers often do too, though you will also see "vacuum packed" with a space.