Japan's bento seem way more on the crafted and enjoyable side of things though. I'm certain there's a lot of variations, but I've seen folks wax poetic about bento and ekiben (train station bentos).
I am Australian, but when I worked in the city one of the most reasonably priced and healthy options was a Japanese restaurant's bento boxes. Quick and easy but also filling. You can also get cheap and hearty meals from the china town food courts. Packing lunches makes total financiak sense but I guess I have a hard time spending my only free hour during the day time at the same place I will be at for 8 hours. A walk and some time lost amongst the hustle and bustle clears my mind.