"East of the Rockies, the Elgin shape butter stick, which is usually about 4.75" inches long and 1.25" inches wide, is the most common size butter stick and you will likely find many brands to choose from.But more searching for "Western-Pack" doesn't yield any more info about why the shapes differ.
West of the Rocky Mountains, you will also find butter "cubes" in what is called the Western-Pack shape. The "cube" size has a width of 1.5".
Due to historical variances in butter printersthough admittedly, it's not very satisfying.
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posted by av123 at 1:40 PM on September 12