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,While commonly associated with ketchup or cosmetic samples in wealthy countries, sachets are widely used in emerging markets to sell inexpensive micro-portions of everyday products, from laundry detergent to seasoning and snacks.

Tiny plastic packets known as sachets have allowed companies to tap millions of low-income customers in the developing world but also unleashed a global pollution crisis.

A Reuters investigation has found that London-listed Unilever plc ULVR.L, a pioneer in selling sachets, has privately fought to derail bans on the problematic packaging despite saying publicly it wants to "get rid of" them.

Here's what you need to know about sachets.

WHAT IS A SACHET?

While commonly associated with ketchup or cosmetic samples in wealthy countries, sachets are widely used in emerging markets to sell inexpensive micro-portions of everyday products, from laundry detergent to seasoning and snacks.

These palm-sized pouches tend to be made up of multiple layers of plastic and aluminum foil, melded together using adhesives, according to Mark Shaw, technical sales manager at UK-based packaging firm Parkside Flexibles.

A typical sachet will have an inner plastic layer that makes an airtight seal around the product, a foil layer that provides an additional barrier against moisture and heat - an important factor in tropical climates - and an outer plastic layer that provides flexibility and can be printed on, he said.

WHY DID THEY BECOME SO WIDESPREAD?

Unilever's India subsidiary, Hindustan Unilever Ltd (HUL), is widely credited as being the first to mass market products in sachets when it started selling tiny portions of shampoo for one rupee ($0.01) in the 1980s.

HUL's former chairman, A. S. Ganguly, outlined the strategy in a publication to mark the firm's 75th anniversary in 2009. "We discovered that wealth lies in rural India, and we reached out to the wider market base," he said, referencing the shampoo sachets.

By the turn of the century, nearly 70% of all shampoo sold in India came in sachets, academic C.K. Prahalad wrote in his 2004 book, "The Fortune at the Bottom of the Pyramid."

By this time, other consumer goods giants like Nestle SA NESN.N and The Procter & Gamble Company PG.N had also started selling reams of products in sachets to consumers across Asia, Africa and the Middle East. Now, 855 billion plastic sachets are sold every year, enough to cover the entire surface of Earth, according to London-based environmental group A Plastic Planet.

WHY ARE SACHETS A PROBLEM?

Proponents say sachets give low-income consumers access to high-quality, safe products. Critics say companies charge the poor a premium because products sold this way are more expensive by volume than bigger packages.

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