The modern Victorinox Companion Swiss Army knife includes a key ring, but some earlier versions of the Companion came without the ring.

These ringless Companions are less likely to snag in your pocket or clothes. You may prefer this type of Companion if you don't need to attach your knife to keys or something else, or if you'd like to collect an unusual, retired version of this small Swiss Army knife.

Companion-- adds key ring
Money Clip-- similar tools plus a money clip, in a larger, 3 1/4 " / 84mm size