Why do Emirates provide all their softdrinks in those miniature cans (150ml)?

Seems totally ridiculous given their frequency of serving drinks and more-so that if I chose to drink alcohol in the form of beer I would be served a full sized 375ml can.

So basically :

-Emirates appear stingy
-150ml is inadequate
-I still need to satisfy my thirst and need minimum 2-3 cans (no weight saving)
-Increased work for staff as they get called to serve drinks more
-Kind of promotes alcohol consumption

Almost as bad as Singapore Airlines pouring you half a plastic cup full, but at least if you ask for a can they give you a full sized one.