I'm really keen on buying the 28" upright duffle bag from Briggs & Riley. Finding a retailer that delivers to Australia is another issue... it's proving to be quite a pain.
Anyway, the reason for my post -
sealed well in a waterproof bag, under the rocks / sand / debris in a large fishtank.....with some nasty looking fish in there.
even better if it was an outdoor pond full of scum. the more unappealing it looks the better.