I'm flying to Mexico for 2 weeks on Sunday. In my packed luggage I have a 4L box of wine. Is this going to cause any issues with US Customs at YYZ? Do I declare it and hope I don't get a power-mad idiot or do I just keep quiet? Last time we transited the US and did the pre-clearance at YYZ, we ended up with a secondary Customs inspection because we had a grapefruit that we were honest about.

Edit: I'm allowed to bring 6L into Mexico.