What is the point of a sack lunch - if any at all?

i found a use to the sack lunch, when i go to someone party and they do a meal, i always want to bring it home (cause i like to steal people's food i guess :D ) but since im not the one who made it i cant put the plate in my inventory, but if i put it in a sack i can put it in my inventory, and put it in the fridge when i come back.