According to many customs in the north, you should bring "cigarettes, wine, tea and sugar".
Tea and sugar in my family have been cancelled, and there must be alcohol and tobacco. But my father-in-law doesn't smoke, so he can't bring cigarettes. In fact, if he doesn't drink, he can buy wine. He doesn't drink, someone always drinks.
Ask the customs of the other family before you leave. Anyway, my family custom is to bring four things, and there must be wine.
Two is too shabby, it must be an even number, and six is too complicated, so it is four. Look at the goods sold in the market, which are basically even numbers. It is very common to pursue even numbers. It would be strange to send three things. According to European and American customs, it doesn't matter if a friend brings a gift or a bottle of red wine. There is no single formal contact in China. Of course, China is very big, and local customs are different. Just because I haven't seen the singular doesn't mean I haven't.
I suggest that you must inquire about other people's customs like your girlfriend. This is the custom of filial piety! No games!
Bring two bottles of the most expensive wine in the man's hometown first. Because when you go to the woman's house, you may have to have dinner with relatives and friends. Be sure to show off the wine brought by the boys. There is really no good wine in my hometown, so buy domestic famous wine. It doesn't matter if two people live in the same place. Buy better wine according to economic strength. Buying wine can reflect the standard of doing things, and you don't have to buy Maotai Wuliangye. Ask the future father-in-law what he likes to drink. And if you are not familiar with it, you should bring famous wine, try to be more than four or five hundred, and it will not look good if it is too bad.
Second, if the woman's parents smoke, just bring cigarettes. It's simple. If you don't smoke, buy a gift, cosmetics and scarf for your mother-in-law according to the price of wine. Now men and women are equal. If you bring wine to your mother-in-law, you must buy something for her. Say hello to cigarettes. If your mother-in-law doesn't support your father-in-law's smoking, don't buy it, it's easy to touch the thunder.
The remaining two, buy local specialty snacks. If it's too much trouble, you can buy two gift boxes at random near the station airport.
The most important thing is the first two, which should be expensive and attentive. The latter two are not easy to carry, so forget it. It's not easy to bring wine by plane, so buy a good wine bar locally.