Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Nikon L31 and Sony W290 side-by-side from the front, back and top in their relative dimensions. Nikon L31 has external dimensions of 96 x 59 x 29 mm (3.78 x 2.32 x 1.14″) and weighs 160 g (0.35 lb / 5.64 oz) (including batteries). Sony W290 has external dimensions of 98 x 57 x 23 mm (3.86 x 2.24 x 0.91″) and weighs 167 g (0.37 lb / 5.89 oz) (including batteries).
Below you can see the front view size comparison of Nikon L31 and Sony W290. Sony W290 is 2mm shorter and 6mm thinner than Nikon L31 but it is also 2mm wider.
Here is the back view size comparison of Nikon L31 and Sony W290.
Now lets look at the top view comparison of Nikon L31 and Sony W290.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon L31 is 7g lighter than the Sony W290 but we don't think this will make a significant difference.
Unfortunately neither Nikon Coolpix L31 nor Sony Cyber-shot DSC-W290 provides any type of weather sealing in their body, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Sony W290's 3" LCD screen is slightly larger than Nikon L31's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.