What do you associate Japan with??
Sushi, sukiyaki, ramen, manga….How about Mt Fuji, Ninja, and Japanese green tea?
If so, you may like those tea bags called “Fujichan” and “Nincha”.
"Fujichan", which is named after fujisan (Mt Fuji), is shaped like Mt Fuji, and " Nincha", which is named after ninja, is shaped like a throwing-star (shuriken in Japanese) which is a must for Ninja.
According to the company, the tea inside is from Shizuoka and selected very carefully by a traditional tea wholesaler.
Personally I prefer tea leaves,but they can be one of the good souvenirs.