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It starts with small air bubbles in the vac pack which is actually gases being created by the meat be aged too long, if it has only a few bubbles usually you can open product an let it breathe so to...

Fridge should be good for 12 weeks as long as seal intact, yes it will improve with age allows emzyme action to break down connective tissue.
Freezer will be fine for a year,air is the main reason...