Background: The problem of increasing amounts of food packaging waste especially in Germany leads to the challenge of how to minor waste by using no packaging in order to listen to environmental-conscious generation y consumers. This is why retailers need to understand the factors impacting the purchase intention and thus, need to act in higher extend in terms of a preventive sustainable approach. Purpose: The purpose of this thesis is to examine the purchase intention of German generation y consumers towards packaging-free products. An extended Theory of Planned Behavior forms the theoretical foundation to investigate which factors are influencing the purchase intention the most. In addition to the original TPB factors attitude, subjective norms and perceived behavioral control, the research model was extended by two new factors, namely environmental concern and barriers. Method: Through an explanatory research method, the data was collected in a quantitative online survey based on a sample of 422 respondents. In order to investigate the relationships among the factors and to further support or reject the study’s hypothesis, the data was analyzedby using descriptive statistics, Pearson correlation and simple and multiple regression. Finally, to determine differences among groups additional tests have been conducted. Conclusion: The findings of this study revealed new insights about predictors of the purchaseintention: German consumers’ intention is mainly impacted by their attitude, followed by thefactor barriers, and perceived behavioral control, whereas subjective norms do not. Further, the other newly added factor environmental concern indirectly impacts the purchase intention through attitude. Moreover, the importance of including new added factors to the original TPB model is shown as the extended TPB model has improved its power in explaining German generation y’s purchase intention towards packaging free. By that, the respondents of this studyare highly environmental concerned and overall intent to purchase packaging-free products in mainstream grocery stores, oats and milk respectively. This study’s results provide valuable insights for marketers of German mainstream grocery stores who are interested in selectively integrating packaging-free shopping to their stores.