Canon 20D weighs 770 g (1.70 lb / 27.16 oz)
and has external dimensions of 144 x 106 x 72 mm (5.67 x 4.17 x 2.83″)
. Considering that the average weight of DSLR type cameras is 773g, its weight is about average in its class. With a thickness of 72mm, it also has an average thickness.
In order to give you a better idea about the real life size of Canon 20D, we have added an image of how it looks next to a credit card and an AA type battery.
Now let's compare Canon 20D size with the camera that it replaced: Canon 10D. Canon 20D is clearly the smaller of the two cameras. Its body is 6mm narrower, 1mm shorter and 3mm thinner than Canon 10D.
Below you can find the comparison of the weight and thickness of Canon 20D with its main competitors:
Canon 20D 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.