Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the Nikon W300 and Olympus E-620 side-by-side from the front, back and top in their relative dimensions. Nikon W300 has external dimensions of 112 x 66 x 29 mm (4.41 x 2.6 x 1.14″) and weighs 231 g (0.51 lb / 8.15 oz) (including batteries). Olympus E-620 has external dimensions of 130 x 94 x 60 mm (5.12 x 3.7 x 2.36″) and weighs 500 g (1.10 lb / 17.64 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon W300 and the Olympus E-620. Nikon W300 is clearly the smaller of the two cameras. Its body is 18mm narrower, 28mm shorter and 31mm thinner than Olympus E-620. As you can tell, actually this is not a fair size comparison since Nikon W300 has a built-in lens but Olympus E-620 doesn't. Once you put a lens on E-620, its thickness will increase significantly.
Here is the back view size comparison of the Nikon W300 and Olympus E-620.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon W300 is significantly lighter (269g ) than the Olympus E-620 which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on E-620, the total kit will weigh much higher.
Weather Sealing
Thanks to the weather-sealed body of the W300, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the E-620.
LCD Screen Size and Features
Nikon W300's 3.00" LCD screen is slightly larger than Olympus E-620's 2.7" screen.