Cask implies storage, often for aging drinks like wine or whiskey to improve flavor over time. Distilleries age whiskey in oak casks for several years.
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Material Matters
Casks can be made from different materials, which may affect the taste of its contents. The brewery uses steel casks for their lager to preserve its purity.
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Associated Drinks
Casks are mostly associated with alcoholic beverages, not other types of liquids. The vintage port was decanted from a cask for the tasting event.