In a letter to the State Library dated 21 May 2007, Wytt Morrô gave some background on the invention of the wine cask. Some extracts are:
"Naturally the actual container of the wine was a plastic bag, for strength it was decided to have a doubled bag, a 'douplex' that I recall being purchased from Charles Steel a Victorian company, they being the most advanced plastic fabricators in Australia at that time."
"Many trials of sizes and proportions were tried to contain one gallon of wine i.e. (six bottles) plus the proportional dimensions of the box to make it convenient to handle and fit into a refrigerator!"
"I vaguely recall we had a black plastic handle made that fitted into two slots in the top of the box."
"By opening a perforated opening aperture on the side near the bottom of the box extracting a section of the bag and then cutting above the seal to pour the wine. To CLOSE, fold the 'spoult' double and sliding on a paper-clip."
"A simple BOLD illustration of facts. A. Here was a container of 6 bottles of wine! B. The manner of opening and closing...for future use. With NO attempt at aesthetic appeal, as later we did in time for Gramps, Hardy's, Kaiser Stuhl, and an advanced idea we did for Seppelts whereby elevating the box from within the sleeve meant that the person could pour the wine straight in their glass on the table. Not over the edge of the table as is the method today!"