Tetra Pak? is one of three companies in the Tetra Laval Group – a private group that started in Sweden. The other two companies are DeLaval and Sidel. Tetra Laval is headquartered in Switzerland.? Every day, across the world billions of litres of water, milk, juice and other liquid foods are consumed. At Tetra Pak, we have developed a range of packages to protect both the nutritional value and the? taste of the products inside. Thanks to Tetra Pak technology, the packaging and distribution of liquid products to the consumer has been greatly facilitated.