The P-38 is small but useful, easy to carry on a key ring or in your billfold, and made of very good steel. I am never without my Swiss Army Knife (made by Victorinox), but some redundency is not a bad idea. The P-38 is good for two other things: (1) it works very well for striking sparks from ferrocerium fire starter rods, and (2) I always filed the aft end of mine down a little on each side to make a flat point screwdriver out of it. That did not interfere with its intended purpose. You can also use a P-38 to slit the tape on packages. I've got several P-51s that seem to be like the P-38s, only better because they are bigger and easier to hold onto. I've always bought both from the Sportsman's Guide catalogs. They are dirt cheap, too. Get a SAK to go with it (the Farmer, Pioneer, or Soldier models with the alox handles) and you will be all set. I buy my SAKs from Smoky Mountain Knife Works. Their catalogs offer 75% trash and 25% good knives. It's up to you to sort them out.