I bought the bag for the S100, according to Canon are both compatible. Even says on the box. Please look at other reviews on the exact characteristics of the bag, I like the concept. However, the bag fits, unfortunately, not so good for the S100 as the S95. The S100 is 1.5mm thinner than the S95, I thought so that the then not so easy; but even the Canon Support was convinced that there are no problems. The there are not, the camera is well protected and sits thanks lateral fit also safe; However, it has on the front / rear tidy room, not a big deal, but a waste of space. And because the bag allows the camera to be already significantly bulkier anyway that's just annoying.
Conclusion: + Super pocket the safe and well protected, and this brings even an aesthetic Plus - 1.5mm is too thick for the S100, what the function does not harm but simply superfluous
Canon could have been trying, a DCC-1455 make for the S100. Too bad.