Canon SX1 IS weighs 615 g (1.36 lb / 21.69 oz) and has external dimensions of 128 x 88 x 88 mm (5.04 x 3.46 x 3.46″). Considering that the average weight of DSLR-Like type cameras is 591g, its weight is about average in its class. On the other hand, with a thickness of only 88mm, it is quite small, 16mm thinner than the average of its class.
In order to give you a better idea about the real life size of Canon SX1 IS, 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 SX1 IS with its main competitors:
Canon SX1 IS 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 Bridge Cameras with Weather Sealing page.