What are you not allowed to carry on a bus?

You answered correctly. On a bus in Germany, you are not allowed to carry dangerous or malodorous materials because they can pose risks to safety and comfort. Objects that could cause injuries to other passengers are also prohibited, as they present a danger in the event of sudden stops or accidents. However, small animals in cages are generally allowed, as long as they do not disturb or endanger other passengers. Remember: anything that threatens passenger safety or comfort is not permitted on public buses.