Lunch foods:

he quintessential bag lunch (also, brown bag from the brown paper sack used to carry it) in North America of the past has consisted of a sandwich and often a whole fruit and either cookies or a candy bar. But now, the near-universal spread of the microwave oven to the workplace since the 1980s has changed the nature of workers' lunches considerably. Leftovers from home-cooked meals, frozen foods, and a huge variety of prepared foods needing only reheating are now more common than the sandwich lunch.
A similar tradition exists in Britain, where schoolchildren and workers bring in a prepared lunch in a lunchbox. This will usually contain, at the least, a sandwich, a bag of crisps and a drink, possibly with a chocolate bar and some fruit. However, this is now changing in the workplace due to the ubiquity of small cafés in cities as well as the microwave. It remains common in schools and among builders where such facilities do not exist on-site.
In Australian primary and high schools, most children bring a lunch box that contains a morning snack for recess (usually fruit or a muesli bar) and a sandwich for lunch.