Each topic below links to the page with the full answer and its official sources.
Kitchen knives go in your checked bag; liquids in the cabin are 100ml (3.4 oz) or less each (Japan MLIT).
Up to 250cm in total and 30kg per piece, 2 pieces per person; over 160cm needs a reservation on some lines (JR companies, checked October 7, 2026).
Visiting Japan: 100V, types A and B (IEC World Plugs, as of June 2025).
100ml or less per container, one clear 1-liter bag per person (Japan MLIT).
Since April 24, 2026: up to 2 per person in the cabin (160Wh or less each), no charging on board (Japan MLIT).
Carry-on size and weight for JAL, ANA, Skymark, Peach, ZIPAIR and other Japanese airlines (checked on each airline's official page on October 6, 2026).