Vacuum packers are a bit like garage door openers - once you've experienced it, you'd never go back. Even more important for fish than meat. I "rediscovered" some bluenose in one of our freezers that was over a year old and still mint. You could be certain that wouldn't have been the case if it was just in a plastic bag.
Labelling and rotation management is definitely worth doing. Sure, bags are a cost but well repaid in food quality and avoiding having to toss UFOs (unidentified frozen objects) that have gone off.
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