We were watching a Cycling Tour on TV yesterday and my 4.5-year old son saw that after having drinks or chocolates those cyclists were throwing the empty bottles/wrappers on the roadside.
I absolutely know that this is not littering and it's a professional event where they have already made arrangements to pick up all the trash left behind and that the cyclists can not stop or slow down to dispose those off properly.
How do I convince my son about that? He says they can keep them in the pockets on their back just where they took them out from. I don't want to tell him it's OK to do so (because he is a child and will try to duplicate the behavior when he is out cycling - at this point he does not know about a professionally arranged race).