What are the carry on restrictions for Japanese domestic flights?

Question:

I'm flying from Kobe to Okinawa and back for Golden Week, and I'm trying to figure out whether or not I'll have to check luggage on the flight back, since I'll be buying omiyage for my coworkers and friends.

Answer:

Best to check with the airline, but if not connected to any international flights, the bag weight limit is comparatively small.
About 15kg for checked-in bags. If you have an international ticket, then the international rules will apply. The same restrictions apply as international - for carry on, no liquids over 90ml, including gels, pastes, etc. And you can't carry things like knives.