A diversion safe shaped like a jar of bath soak, with a loofah visible through the side. The visible contents are the trick: when you can see what is supposedly inside a container, it does not occur to you that anything else is.
On a bathroom vanity or under the sink, among the other bottles and jars. A diversion safe is only hidden while it is surrounded by the thing it imitates — and the bathroom is the room people search last, if at all.
It conceals. It is not an odour container and it is not a humidity environment — the manufacturer makes no smell-proof claim and neither do we. Anything you are keeping for more than a day or two goes in a sealed jar with a 62% pack, and that jar goes in here.
One caveat on the waterproofing: the label is waterproof and the compartment is sealed, but the listing's own spec table separately marks the unit as not water resistant. Treat it as safe on a wet vanity, not as something to sit in the shower.