It seems that almost everyone has the occasional need for medication, even if it is only standard painkillers, but seldom has the pills at hand. Even women whose purses should hold a bottle of aspirins or antihistamine tablets seldom carry any form of pill stash.
While not often completely waterproof there are inexpensive plastic containers available, some even with connections for hanging on a key chain. At the higher end there are aluminum tubes or even waterproof Titanium Pill Fobs available such as the one carried by www.clip-money.com/other.html
Having an extra $20.00 as an emergency cash stash at hand for those times when a credit card cannot be used is another modern requirement. We are so dependant upon ATMs, and credit and debit cards that it is a real inconvenience when we find ourselves in a situation where none of those options are available. The container to be used as a cash stash really does have to be durable and waterproof as typically this money will be very seldom accessed. An aluminum tube works well but is not completely corrosion resistant so perhaps a Titanium Cash Stash such as the dual purpose Pill Fob mentioned earlier might be worth the extra money.
I guess the only potential hazard of hanging the Titanium Pill Fob / Cash Stash from your keychain would be an overzealous police officer thinking it might be used for recreational drug storage.
Any comments on the ideal size or design of such containers or personal experiences will be appreciated.