Canon S100 weighs 198 g (0.44 lb / 6.98 oz) and has external dimensions of 99 x 60 x 28 mm (3.9 x 2.36 x 1.1″). Considering that the average weight of Compact type cameras is 188g, its weight is about average in its class. With a thickness of 28mm, it also has an average thickness.
Here is the front and top view image of Canon S100 with the dimensions:
In order to give you a better idea about the real life size of Canon S100, we have added an image of how it looks next to a credit card and an AA type battery.
Now lets compare the weight and thickness of Canon S100 with its main competitors:
Canon S100 doesn't have any environmental sealings on its body so you got to be extra careful to protect it against water and dust. If you shoot under these conditions very often, consider checking Top Compact Cameras with Weather Sealing page.