I always keep a few large bills hidden away for emergencies in case of theft/loss of my wallet when backpacking in foreign countries. The trick of hiding money has always been in not hiding it in something that was as likely to be taken as my wallet. This double walled container is large enough to hold more than a few of the even larger sized Euro bills/US bills with a screw-in insert designed to hold long wooden matches. With a only a few inner threads it can be easily loosened by hand or with the aid of a P-38 can opener or similar flat utensil.
The author marked this model as their own original creation.