My friend is going to travel to Japan and wants him to buy some cosmetics and eye drops for me. This is a liquid. Can I go through customs? Are there any requirements?

Visitors to Japan can buy some gifts back home, such as eye drops and cosmetics. If the liquid articles do not exceed 30 ml, they are allowed to be carried on the plane as hand luggage. But it's best not to have too much, which will bring unnecessary trouble to the customs. It is suggested that liquid articles should be put in checked baggage as much as possible. It would be better this way.