While Japanese domestic flights will allow you to bring on bottles of tea and wine in your carry-on baggage, international flights from Japan have some new carry-on liquid restrictions.
Starting on 1 October 2010, liquids in travel-size containers up to 100 mL per unit and pastes (namely toothpaste and hair products) up to 100 grams each must be placed in a 20 cm x 20 cm see-through resealable plastic bag. This bag must be taken out of your luggage and placed in a bin when you go through security for your international flight.
100 mL is 3.4 fluid ounces; the same amount as the current US liquid restrictions. The total amount of liquid cannot exceed one liter.
Additionally, PET bottles (sealed or open), refillable bottles likes Nalgenes and “mai bottoru,” and coffee cups may not be taken through security. You can refill your empty bottle on the other side or purchase something from a vending machine after security to bring on the plane.
Larger bottles of liquids/pastes (wine bottles, peanut butter, shampoo) may be placed in checked baggage.
Official announcement from Narita Airport (Japanese)
国際線 (kokusai sen) – international flight
手荷物 (te nimotsu) – carry-on luggage
スーツケース (suutsu keisu) – suitcase (in this case, a large checked bag)
液状物 (ekijou mono) – liquid items
期限 (kigen) – limit, limitation, restriction
透明プラスチック製袋 (toumei purasuchikku seitai) – see-through plastic bag
持ち込む (mochikomu) – to take in, carry on
These liquid restrictions also apply to flights to Korea from Komatsu Airport.
Leah Zoller is a second-year CIR in Anamizu and just happened to have the foresight to put her liquids in a plastic bag in preparation for the return trip from the US.