I was on a winter sled trip in the Brooks Range in Alaska years ago, and we broke a couple of tent poles. This was serious in sub zero temps. Took out my Leatherman and after firing off two rounds from a H&H 375mag, used the file to take the heads off the cartridge cases, making two sleeves. Crimped these around the broken poles as splints, and we were back in business.
I always carry a regular knife for cutting, but you can't do this kind of repair work with a knife!!