Military Survival Kit Can Opener, P-51, US Shelby Co. (Pack of 4)
The P-51 can opener is a great survival tool with many uses.  The P-51 is 2" long, slightly longer than the original P-38, so it's easier to open cans.  It folds to a small size.  It also can be used as a cutting edge, screw driver, seam ripper, groove cleaner, etc.  This 4-pack of P-51 Can Openers allows you to keep one in all the locations you want - the kitchen, hunting pack, camper, back pack, tackle box, tool box, etc.