Epson R-D1 weighs 620 g (1.37 lb / 21.87 oz) and has external dimensions of 142 x 89 x 40 mm (5.59 x 3.5 x 1.57″). Considering that the average weight of Mirrorless type cameras is 416g, Epson R-D1 is a significantly heavy camera for its class. On the other hand, with a thickness of only 40mm, it is quite small, 8mm thinner than the average of its class.
Here is the front and top view image of Epson R-D1 with the dimensions:
In order to give you a better idea about the real life size of Epson R-D1, 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 Epson R-D1 with its main competitors:
Epson R-D1 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 Mirrorless Cameras with Weather Sealing page.