I buy a lot of jam at Migros. Sometimes the lids are not closed. After consultation, I was told that this is often the case
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What exactly do you mean by "sometimes the lids are not closed"? The (no longer quite so) new jam lids have an outer ring as a turning aid, which makes it possible to open the jam jar without much effort. This also eliminates the loud clacking sound when opening. However, this does not mean that the jar is not properly sealed. https://www.blick.ch/wirtschaft/kein-murks-mehr-am-zmorgetisch-das-konfiglas-hat-endlich-den-dreh-raus-id5410773.html