* Simple: We packed our lunches for the picnic.
* Plural: The students enjoyed their lunches in the cafeteria.
* Subject: Lunches are provided for all attendees of the conference.
* Object: The chef prepared delicious lunches for the guests.
* Possessive: The children's lunches were filled with healthy snacks.
* Descriptive: We had a variety of lunches to choose from at the food truck.
The best way to write "lunches" in a sentence depends on what you want to convey.