Minimaize items

Then, I am starting to prepare luggage for Ireland.
What should I bring to there?
“Do you recommend Ingredients of Japanese foods or informative utility items?”

Though I would like to leave from here with a large variety of items, My acceptable luggage is limited up to 30kg at once.
It is hard to select exclusive items…..

Some items which is available in also Ireland are included in as less as possible.
For examples, ordinary clothes and daily items are not expected to arrive with me.