From their site:

Alabama is one of only three states in the country that limits alcohol by volume (ABV) for beer to only 6%, and the only  state that limits beer containers to a size of no more than 1 pint (16 American ounces).

As statewide Prohibition came to end in Alabama, the only politically viable avenue open to those who wanted the sale of alcohol to once again be legal in the state was to place heavy restrictions on that sale. What, when, where, and how alcohol could be sold were all strictly controlled by the legislation which legalized alcohol sales in Alabama--four years after National Prohibition was repealed.

At any rate, now we're one of the least free states in this regard, which is sad but represents a great opportunity for Libertarians to take a stand for a "slam dunk" issue.   (Slam dunk not because the laws are easy to change -- so far the repeal efforts have run aground -- but because it ought to be a slam dunk for beer advocates to get Libertarians on their side!)