Longman Dictionary of Contemporary English
Wiktionary
n. A picnic meal, sandwiches or anything packed and intended to be eaten away from home.
Wikipedia
A packed lunch (also called pack lunch, sack lunch or bag lunch in North America, or pack up in the United Kingdom, as well as the regional variations: bagging in Lancashire, Merseyside and Yorkshire, ) is a lunch prepared at home and carried to be eaten somewhere else, such as school, a workplace, or at an outing. The food is usually wrapped in plastic, aluminum foil, or paper and can be carried ("packed") in a lunch box, paper bag (a " sack"), or plastic bag. While packed lunches are usually taken from home by the people who are going to eat them, in Mumbai, India, tiffin boxes are most often picked up from the home and brought to workplaces later in the day by so-called dabbawallas. It is also possible to buy packed lunches from stores in several countries. Lunch boxes made out of metal, plastic or vinyl are now popular with today's youth. Lunch boxes provide a way to take heavier lunches in a sturdier box or bag. It is also environmentally friendly.
In the United States, an informal meeting at work, over lunch, where everyone brings a packed lunch, is a brown-bag lunch or colloquially a "brown bag", and the practice known as brownbagging. There are also white and other color bags for seasonal use.
Usage examples of "packed lunch".
Returning to the foyer he took delivery of his packed lunch, nodded a reply to the desk clerk's wishes for a bon voyage, and by nine was speeding out of Brussels along the old E.
Leah Street entered and took her neatly packed lunch out of the refrigerator.
It may seem obvious, but it came as a small shock to me to realize that this wasn't going to be even remotely like an amble through the English Cotswolds or Lake District, where you head off for the day with a haversack containing a packed lunch and a hiking map and at day's end retire from the hills to a convivial inn for a hot bath, a hearty meal, and a soft bed.
He had a packed lunch and Yakov was planning on coming up and relieving him, briefly, this afternoon.
He had left immediately after breakfast, taking a packed lunch with him.
I wonder if they bring a packed lunch when they come to your shows.
Serana's packed lunch was clearly superior, but Shanda picked another pine cone to keep.
Having alienated her hostess with accusations of murder, Anna didn't relish getting caught raiding her refrigerator for a packed lunch.
I wore heavy khaki pants, hiking boots, a long-sleeved flannel shirt, a backpack containing a first-aid kit, a packed lunch (baloney sandwich, apple, cheese), a flashlight, a spade, two jars for specimens, several balls of twine, my notepad and pencils, a pocket knife, a compass, and a bottle of spring water.