From Longman Dictionary of Contemporary Englishpacked lunchˌpacked ˈlunch noun [countable] British EnglishDFF food such as sandwiches and fruit that you take with you to work, school etc for lunch
Examples from the Corpus
packed lunch• Waterproofs, wellingtons or other strong footwear and a packed lunch.• Most people had brought a packed lunch and this was eaten in the sun on Kidderminster Station platform.• They had eaten a packed lunch prepared by Evelyn.• She had also prepared a good packed lunch.• We collected our packed lunch from the manageress, and, as the sun again was shining, set out for Helvellyn. 