Thanks, Linglingfool and Evergrn.

I'm planning to send my suitcase directly from NRT to KIX and pick it up at the airport on the day of departure. That way I'll be able to travel just with a bag pack (REI GrandTour) and not worry about towing any luggage.

That said, I usually don't like to rush on the last day and I'm allocating that day to explore Osaka. Since my flight leaves around 10pm, I'll have a full day to see Osaka or even take a short side trip to Kobe early morning. That will also be my last day of JR pass so it'll work out well and I can get to the airport early evening to pick up my bag.