So if we wanted to cache pocket-carry items like water tabs and contractor bags, we could hypothetically disguise them as a geocache along with a bunch of useless toys and audio CDs. Not much is going to fit into a geocache (I'm a letterboxer, and thus consider myself morally above geocaching - letterboxing requires much more thought and, indeed, one to be more clever ).

So the question remains: What do you want to stash, how much of it, and for how long? Unless we're going to stray toward the unlawful, anything that's going to fit into a hypothetical geocache could just as easily be carried with you.