I was a poor kid living in Hawaii in the mid 90's.
Wendy's in Hawaii had a salad bar. If you ordered the "dine in" salad bar, they gave you a fairly small plate and you were allowed one trip.
If you ordered it to go, you still had the one trip restriction, but they would give you a big plastic clamshell to go container. They assumed you would put food in the bottom of the container and close it up and leave.
Not me. I would order to go, but fill both halves of the container and eat it all at one of the tables. Usually one of the halves was mostly Chocolate pudding and cheezy crackers.