What ingredients should I stock in japan

I am fortunate enough to travel to japan next month and I will have a suitcase to fill with i ingredients. I especially look for thing that are compact and impossible/hard to find in europe or crazy overpriced.
The nabe cubes in the picture are great, and i have of course curry, high quality dashi, dashi salt, yuzu kosho, furikake and 100% buckwheat soba.

I can bring liquids but usually the weigh/size is too inconvenient, so I'd get something super concentrated and with a long shelf life.

Thanks for the advice!