коричневый пакет (приносить еду на работу или мероприятие)
We decided to brown bag it and have a picnic in the park.
Мы решили взять еду с собой и устроить пикник в парке.
Definitions
A 'brown bag' refers to an informal meeting or event, often held during lunchtime, where participants bring their own meals (traditionally in brown paper bags) and discuss a particular topic, usually in a work or educational setting. It can also simply refer to carrying food in a brown paper bag.