When you get to the main entrance in building A and building B you will see some green bio waste bags. These are the ones that the Copenhagen municipality gives a away for free to focus on waste sorting. Normally, you can order them for free on the website of Copenhagen municipality but you can also easily grab them on your way home from AAU's campus in Copenhagen.

The bags are placed in boxes by the foyer in building A and in building B. Look for the green sign with the text "Mangler du bioposer?". The bio waste bags are to take for your own use.