Wine contains tannins, a natural substance inside of grape skin. Suddenly though, you're paying a premium to be fashionable.
Overall, this review of packaging cost for wine has these assumptions: a boutique winery with a run of 500 cases and not them owning the bottling equipment. https://lively-koala-kbzsb7.mystrikingly.com/blog/ch-t-l-ng-s-n-ph-m-d-c-ki-m-tra-chu-n-ch-nh-m-c-ben-tren-c-nghiem-ng-t