I have been asked by a Colombian friend to bring a few bottles of alcohol with me (from the US) when I visit Colombia this month (November 2016). After some research I have found that I can bring two (2) bottles of alcohol into Colombia, but I have been unable to find the maximum size of bottles allowed.

Is there a maximum size (volume) restriction to the bottles that can be legally brought into Colombia (I'm assuming 'yes') and, if so, what is the size restriction?

Bonus points if you can reference a source. ;)