This time, I used the luggage direct delivery service to the airport for both my return trips from Kyoto and Osaka. I recommend using this service on your first day at the airport to have your large luggage delivered directly to your hotel. This avoids your luggage inconveniencing others on subways and buses, especially since the pedestrian paths in Osaka and Kyoto sometimes have inclines, and dragging luggage all the way to the hotel can be exhausting. For the return trip, it completely frees up your hands, allowing you to comfortably enjoy the last day of your journey with just a backpack. You'll even have room to buy more if you wish. Your luggage will be easily retrieved at the airport at your scheduled time. Remember not to go to the wrong floor or direction; luggage pickup is on the fourth floor of Kansai Airport. Allow enough time to collect your luggage before checking in and dropping it off, so you can continue to shop and explore the airport to your heart's content.