LauraA -- You have inspired me. Truly. I didn't want to mention anything yet because I hadn't tested anything out yet, but over the past week I've been adjusting my packing list, and I think I will be able to pack with just my Synapse and Packing Cube Shoulder Bag on my upcoming trip to Japan (we fly out next weekend).
Once I compile everything together, I'll try to take photos and post them as well.
Thanks again, LauraA!