OeTTINGER Returnable Month of May: Standard bottles instead of individual bottles

There are just five types of bottles that we use for our drinks: NRW 0.5 liter in brown and white, Longneck 0.33 liter in brown and white as well as brown 0.33 liter Steinie bottles. Why do we use just these standard bottles instead of branded individual bottles? Watch the video to find out! (Video in German)