YI M1 weighs 350 and has external dimensions of 114 x 64 x 34 mm (4.49 x 2.52 x 1.34″). Considering that the average weight of Mirrorless type cameras is 437g, YI M1 is a remarkably light camera for its class. Even better, with a thickness of only 34mm, it is also quite small, 16mm thinner than the average of its class.
In order to give you a better idea about the real life size of YI M1, 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 YI M1 with its main competitors:
YI M1 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.