Cask ale more plastic casks around than wooden ones. Plastic casks are increasing in popularity because they are cheaper to buy and lighter to carry. Though they don't last as long, they are also less likely to be stolen as they have no melt-down value. Beer casks come in a number of sizes, but by far the most common in the pub trade are those of 9 gallons (72 pints or roughly 41 litres) which is known as a Firkin and 18 gallons (144 pints or roughly 83 litres) known as a Kilderkin. (N.B. These are imperial gallons, equal to 1.201 US
Firkin Brewery filled with a stamp from each pub visited, and public transport directions to the nearest pub in the crawl would also be in the "passport". Although there was no stipulation in the rules that the 12 pubs had to be completed on the same day, this was often the goal of participants. Firkin pubs in Canada and the United States operate under the Firkin Group of Pubs franchise, a chain of English theme pubs founded in southern Ontario in 1987. The naming scheme for the pubs is similar to that of the UK chain (for example, "The Crown and Firkin",