I think most of the people who order McDonalds in large quantity are mainly because they want to have more fries, not really emphasizing on the drinks because the drink can be refilled for only 50 sens on soft drinks only.
I’m pretty sure they are well aware of this so now they have Mega Fries. The size of Mega Fries is much like two times of regular fries. It is stated on the menu board saying for available time only, I guess it is just a temporary hype set like Nasi Lemak Burger or Grilled Chicken Burger (GCB). The packaging comes with the football theme so I assume this will be available until World Cup 2018 ends or until end of July.
Nonetheless, I personally couldn’t finish my fries even for regular size. But my husband is a French fries eating machine so we ordered this mega fries mostly for the sake of him.