Has anyone ever put together a homemade survival staff - that is, a hollow hiking staff designed to carry some essentials inside it? Maybe an aluminum or fiberglass staff, a single piece or made in several sections, or from a combination of materials? Seems like an interesting idea, at least in theory. I've seen a book for sale on how to make one type and another staff that was commercially manufactured, but am more interested in hearing from anyone who has made (and used!) one.