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My understanding is also that canning lines can be a lot more compact than bottling lines, so cheaper/easier to install in a smaller brewery. For a while, I know there were a couple local breweries who essentially time-shared a canning line on the back of a truck that would just drive between the breweries and was cheaper than all of them buying it themselves.

>- They weigh less and are more compact than bottles

This is the real key one. My intel from a brewery that was sadly bought by Coke was that the savings in transit & shipping is staggering. More beverages in the same amount of space, which also means less costs for refrigeration.

That and millennials greatly prefer cans while the older generation prefers glass. Guess who is buying more craft beer?