Those bladder in cardboard box type containers must survive on rough going as the aboriginal communities were just about paved with the empties and some of those communities are a long travel on bad roads from the liquor store. There must have been thousands of empties littering the roads and communities in 96-97 when I was on a locate and identify project in Mt. Isa region for DSS. Regional slang in North and West Qld for a wine cask is "a gin's handbag".
As well as 4, 5, and 10 litre casks, you can get 20 litre ones. Caterer's packs I think they are called. Size of a small suitcase or school port.

