Big enough to share with your party then sure but my peeve is to take leftover food to go. I can gripe about it all day but here are a few.
1. You have to ask for a to go box and bag. It is hard enough to catch your waiter's attention to ask for this.
2. You have to box it. Sitting down while trying to box it is a hard task.
3. The food is going to put a smell in your car while you drive it home.
4. By the time you get home, you have less to no desire to eat your leftover.
So how about feeding the homeless person with your leftover? To me, I don't ask anybody to eat my leftovers. If I am going to share with you, I'll break halves before the first bite. I rather buy a homeless person a new order instead.