An odd question, I know.
I'm expecting to arrive with a full-size carry-on, containing some stuff I brought on the flight but don't want to carry any further, some stuff I'll transfer into my main baggage between collecting it from the belt and dropping it off with WFS for onward delivery, and some stuff I'll carry with me in a much smaller bag waiting in my main suitcase. I don't really want to elaborate on why this is the case as it will distract from the main question - nothing nefarious is going on, I just have a slightly complex itinerary and don't want to lug any more than I need to at any point.
I'm then left with an unwanted carry-on bag containing a few innocuous cheap unwanted possessions (nothing unpleasant, not even any dirty clothes). I'll deliberately use an old and slightly broken (torn handle) bag that I've already replaced and is currently just cluttering up my house. If it were a soft bag I'd roll it up and stuff it in a litter-bin, but it's a somewhat rigid two-wheel trolley bag that won't fit in any normal bin.
What I obviously don't want to do is leave a bag just lying around in the airport and trigger a security scare. My current best plan is to casually drop it onto a loaded baggage belt, where it can go round and round until eventually the baggage handlers recover it. There will be no obvious means of identification on it, and I will leave a note inside in English and Cantonese saying that I don't want it any more, to save them wasting any effort trying to track down an owner. Then they will presumably just dispose of it by whatever means they have for unidentifiable lost possessions.
Anyone have any better ideas? Maybe this is all needless subterfuge and there's actually a handy bulk rubbish container tucked away somewhere that I could chuck it into? In or near the baggage reclaim, ideally.