got the bunnings one as well, but bought one from the caravan show as they had a proper one lined inside for only $25 for 10mtrs. But the bunnings one works well so far.
We also use the black waste tube and cut it half with a couple of male joiners and then used some rubber tube to connect them together if needed, we store ours inside the chassis rails.
I have the same as Stone Stomper and also have cut it in half and store in my chassis rails. A great place to store it, got a joiner from bunnings and presto, a longer hose.