Environmental group Greenpeace on Thursday accused Nestlé of not doing enough to reduce single-use plastics polluting landfills and oceans.
Jennifer Morgan, executive director at Greenpeace International, said the world's biggest food group should set a target for reducing single-use packaging and invest in alternatives focusing on refill and reuse.
"Nestlé is a major contributor to the plastic crisis and environmental problem that we have right now," Morgan told Reuters on the sidelines of the company's annual general meeting in Lausanne, where Greenpeace activists intervened shaking banners.
Earlier this week, the world's biggest food company had recognised the reduction of plastic waste as an 'urgent priority' for the organisation.
Nestlé chief executive, Mark Schneider, said he thought focusing exclusively on reusable packaging was wrong.
"Why rely on just one lever when you have four or five you can use," he said, citing the importance of biodegradable packaging and recycling.
Growing concern over environmental issues - from climate change to plastic pollution - has triggered a wave of global student protests, piling pressure on policymakers and business leaders.
Coca-Cola, PepsiCo and Nestlé are the world's biggest producers of plastic waste, according to a report last year from Greenpeace and the Break Free From Plastic movement.
It analysed 187,000 pieces of trash collected in 42 countries.
Duncan Pollard, Nestlé head of sustainability, said the company agreed about the need to reduce plastic use.
"But we need to make sure the new packaging solutions are safe and that consumers accept them," he told Reuters, adding it was too early to say plastic use had peaked.
Nestlé has said it used 1.7 million tonnes of plastic packaging last year.
Greenpeace said that was up 13%, but Pollard said Nestlé had since changed the way it measured plastic use and the true rise was below 3%.
Last month, the European Parliament approved a law banning a wide range of single-use plastic items by 2021.
Nestlé has vowed to make 100% of its packaging recyclable or reusable by 2025 and push the use of compostable and biodegradable materials polymers.
Greenpeace criticised Nestlé's promises as lacking transparency, clear targets and significant investment.
"Material substitution is a false solution," Morgan said. "It will just shift the impact to the world's forests and agricultural lands."
Pollard said he didn't share concerns about deforestation and thought the shift to paper would help tackle climate change.
Nestlé was also working on a new system of water dispensers.
Greenpeace on Wednesday launched a "plastic monster" video showing a fictional "Nestlé Chief Plastics Officer" trying to buy a single-use plastic bottle of the company's Pure Life water from a vending machine and having dead fish and slimy waste explode in his face instead.
The one-minute spot ends with the slogan "Tell Nestlé to stop single-use plastic".