We recommend bringing one suitcase per person plus one carry-on bag, which can be used as a day pack or overnight bag.
We do not go sightseeing with suitcases. We travel with luggage to the next hotel and then store all the bags at the hotel before going sightseeing. Because we travel on trains with luggage, it is best if you can lift your suitcase over your head to fit in the overhead storage.
If you would rather not travel with luggage, you can opt for a baggage delivery service. The service is approximately 2,000 yen per suitcase and your bags will arrive the next day.