Samsung NX300 weighs 331 g (0.73 lb / 11.68 oz) and has external dimensions of 122 x 64 x 41 mm (4.8 x 2.52 x 1.61″). Considering that the average weight of Mirrorless type cameras is 435g, Samsung NX300 is a remarkably light camera for its class. Even better, with a thickness of only 41mm, it is also quite small, 8mm thinner than the average of its class.
Here is the front and top view image of Samsung NX300 with the dimensions:
Now lets compare the weight and thickness of Samsung NX300 with its main competitors:
Samsung NX300 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.