Just returned from 2 weeks in Mendoza, and brought back 2 cases of wine. For wine country this should be commonplace but it was surprising that many wineries did not have the styrofoam boxes or had no idea whether we could take wine back. We did track down a supply company in the city with the boxes. In LAX we were sent to secondary customs review after a 30 minute wait and the agent didn't know what she was talking about... Tried to tell us we were only allowed 1 liter per person total. Fortunately I had the CBP website open on my phone and showed her that it says you get 1 liter duty free and 3% duty on each bottle after. She was gracious and let us through without paying the $9 fee, just asked is to think of her when we drink it! So go through LAX well prepared.