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 Panasonic ZS10 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). Panasonic ZS10 has external dimensions of 105 x 58 x 33 mm (4.13 x 2.28 x 1.3″) and weighs 219 g (0.48 lb / 7.72 oz) (including batteries).
Below you can see the front view size comparison of Nikon L31 and Panasonic ZS10. Nikon L31 is 9mm narrower and 4mm thinner than Panasonic ZS10 but it is also 1mm taller.
Here is the back view size comparison of Nikon L31 and Panasonic ZS10.
Now lets look at the top view comparison of Nikon L31 and Panasonic ZS10.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon L31 is significantly lighter (59g ) than the Panasonic ZS10 which may become a big advantage especially on long walking trips.
Unfortunately neither Nikon Coolpix L31 nor Panasonic Lumix DMC-ZS10 (Lumix DMC-TZ20 / Lumix DMC-TZ22) 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
Panasonic ZS10'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.