Students of travel, however, will note that the ketchup sachets conform to universal standards of unopenability.
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Unilever started doing this years ago, by selling shampoo in small sachets as well as in pricier bottles.
Now, the technologists just have to devise the technological equivalent of shampoo sachets.
He carries sachets of yellow-blue vitamin capsules in a wide white metal tray.
The vast majority are not bothered because they buy drinking water either in sachets or in plastic kegs from street vendors.
Hindustan Lever, a subsidiary of Unilever, pioneered the idea years ago, marketing its shampoos and detergents in single-use sachets rather than larger (and more expensive) bottles.
Retailers sell sachets after filling them up with the liquor.
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Those stores are flexible in responding to the needs of their communities: They sell candies by the piece, cigarettes by the stick, shampoos in sachets, and vinegar and cooking oil in smaller packets.
Ready meals will become more popular: Brazilians still cook most meals from scratch, even though the country has some of the world's biggest food-processing companies, which export their tins and sachets to America and Europe.
More than five million children in 15 developing countries have received sachets of vitamin and mineral powders that have been approved by UNICEF and the World Health Organization as a cost-effective treatment for iron deficiency.
Unilever has long had a strong distribution network in India, but it has expanded its efforts with a division called Shakti, which provides Indian women's self-help groups with business education and the chance to earn a living selling cheap sachets of Unilever products.
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