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 Canon A3100 IS and Olympus 5010 side-by-side from the front, back and top in their relative dimensions. Canon A3100 IS has external dimensions of 97 x 58 x 28 mm (3.82 x 2.28 x 1.1″) and weighs 165 g (0.36 lb / 5.82 oz) (including batteries). Olympus 5010 has external dimensions of 95 x 56 x 20 mm (3.74 x 2.2 x 0.79″) and weighs 126 g (0.28 lb / 4.44 oz) (including batteries).
Below you can see the front-view size comparison of the Canon A3100 IS and the Olympus 5010. Olympus 5010 is clearly the smaller of the two cameras. Its body is 2mm narrower, 2mm shorter and 8mm thinner than Canon A3100 IS.
Here is the back view size comparison of the Canon A3100 IS and Olympus 5010.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Olympus 5010 is significantly lighter (39g ) than the Canon A3100 IS which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Canon PowerShot A3100 IS nor Olympus Stylus 5010 (mju 5010) provides any type of weather sealing in their bodies, 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
Canon A3100 IS and Olympus 5010's LCD screens have the same diagonal size of 2.70 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.