I have two (maybe three) 20L food cache containers left over from recent AAWT trips.
Two are steel clip lock lid types and (maybe) one is the plastic press-fit variety.
All three are in Melbourne for free collection. All come with a caveat that they must be collected once you have used them - we love the bush so much how could we dream of making it worse for leaving rubbish behind heh?
PM me if you are keen to make use of these for your epic (and unforgettable) AAWT journey.