My dad gave me a camp set that he'd used in the Forest Service long before I was born. It had a knife / can opener / bottle opener, spoon, and a fork that all nested together and locked into a spring steel clip. My son lost it at summer camp one year and I've never seen another like it. It was very compact and fit into a WWII Army mess kit.
If I could find one again at a reasonable price, I'd buy it. Heck, I'd buy two of the durn things.