If your concern is really about the practical aspect of opening cans, which doesn't come up as often as it used to (lots of pop-tops and foil pouches these days, and aluminum yeilds to anything sharp a lot easier than steel), you might want to consider carrying a military P38 can opener. They're tiny, weigh a small fraction of an ounce (less than another blade on a knife or multitool), can be carried on a key chain or in a wallet, and they work well. I don't think the military has used them since they abandoned C-rations, but I still see them selling cheaply on eBay- I think I bought a lot of 10 for $5. The ones stamped "US Speaker" seem to be a little better than some others- I have one of those that's probably 30 years old now, the finish is completely worn off, and it still works fine. Saved me grief more than once.<br><br>I'm carrying a single-blade folder and a Leatherman Micra these days, which complement each other nicely, but one of the few things the combination lacks is a can opener. Stick one of these in your wallet and you can forget about the problem.<br><br>