It is based on traditions and marketing. In eastern european contries you can often find pickles, beet roots and other pickled vegetables packed in plastic bags, they also have those in jars and cans. What surprised me, as I never saw it is sausages packed in jars, never seen it before I went to Germany. Since I am from Lithuania and every meat product is packed in plastic vacuum bags. A heard people from US is very surprised to see milk packed in plastic bags when they first visit eastern europe.
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