Stick it...

Here's another idea from Kickstarter - The 'Ti2 Sentinel Titanium Cache Sticks'. These secure titanium rods have just enough room for a document, a bit of currency, or a dose of medication. Sealed with 'O' rings to keep things dry. Be one of the first to use them by pledging.

Ti2 Sentinel via KickStarter:

www.kickstarter.com