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I wanted to get a small SAK for my keychain - dual-layer only, because 3 is oversized and 4+ is just stupid. Ended up buying Victorinox Tinker Small (84mm version of 91mm Tinker/Spartan, aka Tourist with a Philips screwdriver). It's not quite a keychain-sized knife, but I hope that it will not be too big for this use case.
At first I considered 58mm, but those look more like toys than actual tools. And they're overpriced - 58mm Rambler with no accessories would cost me the same as 84mm Tinker Small with official™ Victorinox-branded chain/quick release + a straight pin that is stored inside the scales.
