This is a contribution to the optimization of packaging processes for plastic containers. It is common practice, to apply a stepwise packaging for a product. The so called primary packaging contains the product, prevents it from environmental influences and ensures that hygiene standards are fulfilled. A Secondary packaging facilitates the distribution of goods from the supermarket to the home of the consumer and a tertiary packaging is necessary for the shipment of the product on a pallet from the supplier to the customer. A widespread method for secondary packaging is the use of oriented Polyethylene (PE) shrink films. These films are designed to meet the individual requirements on their shrink behavior and thereby on the mechanical properties of the resulting secondary packs. The single layers of multilayer films can consist of material blends of Low Density-, Linear Low Density- and High Density PE (LDPE, LLDPE and HDPE). Within this high diversity of shrink films, the choice of an appropriate type depends on the individual mechanical properties of the product and on the desired pack size. Extensive testing in combination with a high level of expertise is afforded for that matter. The objective of this study is to simplify the packaging development using numerical methods. The procedure is described for the example of a pack consisting of six plastic bottles. A FE-Model of the shrink process is built up and calibrated experimentally. This Model predicts internal stresses, strains as well as shape and thickness distribution of the shrink film after it has been processed in the oven. In a follow-up FE simulation a load is applied to the resulting six pack whereas the mechanical properties of the shrink film are described using a rate dependent elastoplastic material model. Parameters for the material model are fitted to uniaxial tensile test data. The result of the “load simulation” is compared with corresponding experiments and thus validates the numerical method