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Such had been the extent of its decline that the term "lunch box" had come to be associated more with a certain 100m sprinter than with carrying midday meals.
But as food prices remain sky high and disposable income shrinks fast, the packed lunch is enjoying an unlikely renaissance in the UK.
And with it no longer the preserve of school playgrounds, the content of the nation's lunch boxes is changing dramatically. Out go limp cheese and ham sandwiches on white bread; in come exotic fruits, mixed salads and experimental pasta dishes.
Yes, the next phase of the foodie revolution is all about mobility and making it yourself. Sales of food and drink containers are rising.
At the same time, this shift in the way we eat - dubbed the "credit munch" - is hitting the takings of sandwich makers and fast-food restaurants.
Thermos, whose food and drink flasks are often viewed as the preserve of hikers and the elderly, has seen a 30 per cent increase in sales over the past year. And at the retailer Robert Dyas, sales of lunch boxes have risen by 68 per cent, year on year.
Inspired by cookery programmes and the lunch recipes created by celebrity chefs - from Mark Hix's Cornish pasties to Jamie Oliver's pasta salad - the nation is looking beyond swift snacks and bags of crisps.
"People are definitely making more exotic lunches now. Puy lentils, feta cheese, couscous, haloumi ... they are taking their cue from the high street. They see things like oriental salads at places like M&S, and think 'I can make that'," said Janine Ratcliffe, food editor of Olive magazine.
Unsurprisingly, health campaigners, who have attacked some high-street retailers for selling sandwiches that are high in fat and salt, are celebrating this shift away from shop-bought lunches.
Lisa Miles, senior nutrition scientist at the British Nutrition Foundation, said that the surging number of people making food and taking it to work with them were more likely to be eating a better diet.
"You will be thinking about lunch in advance and preparing it at home, instead of grabbing something that you walk past in a rush, which might be unhealthy," she explained.
However, Ms Miles added that people should resist the temptation merely to slap a slice of cold meat between two bits of bread.
"Sandwiches are a classic, but it is important to vary things so that you get a range of nutrients and don't get bored."
High-street retailers around the country are feeling the effects of this newfound confidence. With profits plummeting, chains such as Pret a Manger and M&S are offering new "economy" choices and freebies in an attempt to hold on to customers.
Marks & Spencer's award-winning sandwiches and salads have long been popular with millions of British workers, but last week it announced that it is to slash food prices, following a 5 per cent drop in sales.
Meanwhile, the convenience-food maker Uniq, which supplies foods and ready meals to supermarkets across Europe, warned earlier this month that it expected to make a loss in the second half of this year, noting that sales of sandwiches had slowed significantly.
And at the end of last month the sandwich and salad chain Pret A Manger introduced an economy range, which includes a chicken, salad and rocket sandwich for £2.40 ($6.30).
"We have launched a range of products that are less premium, to reflect our sensitivity to people's pockets," explained Simon Hargraves, the chain's director of food.
"People are still getting coffee, but not as much food as they used to," he added.
But statistics indicate that a growing number of cash-strapped commuters are also ditching their shop-bought coffee. On average a takeaway cappuccino or latte will cost £2.05 ($5.40), and many people have opted to brew their own at home and take it with them.
Sales of Thermos portable tea and coffee mugs have increased by 40 per cent over the past year.
This shift away from ready-made lunches could also have a beneficial effect on the amount of food wasted.
A survey commissioned by the Government's Waste & Resources Action Programme (Wrap), as part of its Love Food Hate Waste campaign, revealed last week that British workers shell out £5.5bn on shop-bought lunches each year, while leaving the same amount of food to go off at home.
Research suggests that if people make their own food they are less likely to simply chuck it out. Good ingredients, it is claimed, tend to hold their appeal for more than a single meal.
- INDEPENDENT
