Canon 30D weighs 784 g (1.73 lb / 27.65 oz)
and has external dimensions of 144 x 106 x 74 mm (5.67 x 4.17 x 2.91″)
. Considering that the average weight of DSLR type cameras is 773g, its weight is about average in its class. With a thickness of 74mm, it also has an average thickness.
In order to give you a better idea about the real life size of Canon 30D, we have added an image of how it looks next to a credit card and an AA type battery.
Now let's compare Canon 30D size with the camera that it replaced: Canon 20D. Canon 30D has the same height and width with Canon 20D. On the other hand, with a thickness of 74mm, it is 2mm thicker.
Below you can find the comparison of the weight and thickness of Canon 30D with its main competitors:
Canon 30D 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 DSLR Cameras with Weather Sealing page.