You honestly don’t need them though. If you pressure can homemade chicken soup yourself (don’t water can meat or starches, but pressure canning is the same thing with different equipment and not very difficult), the quality loss you have over two years is negligible. It’s possible that the meat gets a little tougher, but it’s honestly surprising how little it’s affected by 90 minutes of superheating.
You only use them if the only things you care about are consistency and price.
You honestly don’t need them though. If you pressure can homemade chicken soup yourself (don’t water can meat or starches, but pressure canning is the same thing with different equipment and not very difficult), the quality loss you have over two years is negligible. It’s possible that the meat gets a little tougher, but it’s honestly surprising how little it’s affected by 90 minutes of superheating.
You only use them if the only things you care about are consistency and price.
Consistency is a very big deal for commercial products, they have a legal requirement for accurate labeling.