Tetra Pak - which is one of the world's largest packaging companies for milk, juices and other drinks - has hired Golin Harris to provide advice.
The agency won a four-way pitch in order to secure the brief. There was no incumbent.
Golin Harris UK joint MD Jonathan Hughes said the agency would stress the brand's environmental pedigree. Its campaigns will, for example, promote how Tetra Pak only uses wood from forests that have been approved by the World Wildlife Fund.