Design for recycling is widely seen as a key element for a circular economy for plastics. However, for the packaging sector as the largest application area of plastics, the reuse of recyclates in the same sector is also essential, otherwise the recyclate markets for the special packaging plastics will become too small in the long term. The requirement for the high-quality reuse of recyclates makes design from recycling an additional necessity, especially for food packaging applications. This, together with design for recycling, establishes design for circularity and thus helps to close true material cycles. In the case of packaging, however, it is also necessary to keep the loss of packaged products at a minimum in order to minimize the environmental impact of the entire product. To this end, the barrier function of the packaging is an essential prerequisite that must not be sacrificed in favor of easier recycling. Technologies that can be used to apply thin barrier layers to plastics thus acquire central importance. They can be used to both maintain packaging functions and minimize the risk of product contamination from recyclates without compromising recyclability. These relationships are presented in this chapter, along with the most important current design for recycling guidelines.