The cellulose-based material Cottonid is one of the oldest plastics in the world and consists of 100% cellulose. It has very good mechanical properties, is easy to process mechanically and therefore has the potential to replace petroleum-based plastics in technical applications. Cottonid is produced as sheet material, which can be formed to produce parts of low complexity. In order to evaluate the feasibility of more complex geometries, however, it is necessary to characterize the formability so that an appropriate forming process can be selected depending on the stress state. Therefore, Forming Limit Curves (FLC) have been generated at different moisture contents. It was found, that the mechanical behavior is strongly influenced by moisture. In the tensile tests e. g., elongation increases of up to 500% have been demonstrated for specimens with high moisture content. However, not all stress states benefit equally from moisture. The study thus provides a scientific basis for the future production of complex components made of cellulose-based materials.