The can opener on mid-sized and large Victorinox Swiss Army knives includes a sharp, effective can opener, plus a small screwdriver tip. This blade is also useful on occasion for various scraping or prying functions (unlike the Wenger can opener, which is designed strictly for opening cans).
Uses: The Victorinox can opener is not the world's fastest can opener, but it does a decent job for occasional use. The trick is to puncture the can with the sharp part of the blade, and then move forward by about 1/4" (6 mm) and slice a bit more of the can with the sharp, curved part.
WARNING: The can opener tends to leave a jagged edge on the can, so use caution!