Canon SD780 IS weighs 155 g (0.34 lb / 5.47 oz) and has external dimensions of 87 x 56 x 18 mm (3.43 x 2.2 x 0.71″). Considering that the average weight of Compact type cameras is 188g, Canon SD780 IS is a remarkably light camera for its class. Even better, with a thickness of only 18mm, it is also quite small, 10mm thinner than the average of its class.
In order to give you a better idea about the real life size of Canon SD780 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 SD780 IS with its main competitors:
Canon SD780 IS Size Compared to Main Competitors
Canon SD780 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 Compact Cameras with Weather Sealing page.