Walki®Pack D is a solution developed especially for packaging washing powders. "D" stands for detergent. It consists of a strong grey cardboard as the base material, a barrier layer for protection from water vapour and a thin, coated paper for printing and finishing. Conventionally, this type of water vapour barrier is manufactured from petroleum-based polymers. As an innovator and pioneer in the field of sustainability, Walki has also developed an even more sustainable concept called Walki®Wood Pack-D, which uses alternatives made from tall oil for the barrier. Tall oil is a by-product of pulp production. As such, it is obtained from vegetable raw materials, but it does not compete with food production. Tall oil can be used to produce coatings with the same properties and barrier levels as those produced from crude oil.