The Cash Stash Keychain(GBP 5; about $8) will let you store a £20 note or a $20 bill in a waterproof capsule, the capsule is made from aircraft grade aluminum and with a waterproof ¡®O¡¯ ring. Simply unscrew the capsule, wrap your note(s) around its internal stainless steel CashClip and hey presto ¨C a secret stash of emergency cash.
