I think I may have found a better solution to portion control than I realised. Because it looks like the Japanese have already come up with that solution. Apparently, all one needs to know is 3 parts carbo, 1 part protein, 2 parts vegetables and select the container based on the volume.
So, it looks like the Tupperware lunchbox that I’ve been carrying around is the 900 ml one and what I really should be eating is a 600 ml container.
Well, have ordered some bento sets from ebay Malaysia. Now all I have to do is wait for them to come but in the mean time, just use what I currently have at hand.