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 ELPH 140 IS and Canon G15 side-by-side from the front, back and top in their relative dimensions. Canon ELPH 140 IS has external dimensions of 95 x 54 x 22 mm (3.74 x 2.13 x 0.87″) and weighs 127 g (0.28 lb / 4.48 oz) (including batteries). Canon G15 has external dimensions of 107 x 76 x 40 mm (4.21 x 2.99 x 1.57″) and weighs 352 g (0.78 lb / 12.42 oz) (including batteries).
Below you can see the front-view size comparison of the Canon ELPH 140 IS and the Canon G15. Canon ELPH 140 IS is clearly the smaller of the two cameras. Its body is 12mm narrower, 22mm shorter and 18mm thinner than Canon G15.
Here is the back view size comparison of the Canon ELPH 140 IS and Canon G15.
Now lets look at the top view comparison of Canon ELPH 140 IS and Canon G15.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon ELPH 140 IS is significantly lighter (225g ) than the Canon G15 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Canon PowerShot ELPH 140 IS (IXUS 150) nor Canon PowerShot G15 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 G15's 3.00" LCD screen is slightly larger than Canon ELPH 140 IS's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.