South Australia, and I think Northern Territories, has a 10c return scheme for any drinks containers that are commonly used on the go. So all drinks cans and any smaller serve bottle and carton drinks. Just not the family size ones that are usual only consumed at home. The exception is the large pop bottles, which still have the return deposit. You can take them in any quantity to collection points and get cash for them. It works really well, because while they still get dumped by some, they don't stay there for long. Someone will pick them up for the 10c. People will even go through bins for them. It's one of the cleanest states because of it.

It's definitely worth putting that incentive there.