The process for packaging 'cask wine' (boxed wine) was invented by Thomas Angove, a winemaker from Renmark, South Australia, and patented by his company on April 20, 1965. Polyethylene bladders of one gallon (4.5 litres) were placed in corrugated boxes for retail sale. The original design required that the consumer cut the corner off the bladder, pour out the serving of wine and then reseal it with a special peg and was based on a product already on the market, which was a bag in a box used by mechanics to hold and transport battery acid.