Is that allowed?

I'm currently on vacation in Italy, traveling via Switzerland and France to Germany soon. I found a beer here that I really like, but it's not available in Germany, so I want to take it with me. I'm wondering what customs regulations I have to abide by, since I googled it and I think it was 5 liters in Switzerland and 15 liters in France (correct me if I'm wrong). It should be noted that we're basically just transiting through Switzerland, so we're not stopping there or getting out, if that makes a difference.

Thanks in advance