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 Canon ELPH 150 IS and Panasonic ZS40 side-by-side from the front, back and top in their relative dimensions. Canon ELPH 150 IS has external dimensions of 95 x 57 x 24 mm (3.74 x 2.24 x 0.94″) and weighs 142 g (0.31 lb / 5.01 oz) (including batteries). Panasonic ZS40 has external dimensions of 111 x 64 x 34 mm (4.37 x 2.52 x 1.34″) and weighs 240 g (0.53 lb / 8.47 oz) (including batteries).
Below you can see the front view size comparison of Canon ELPH 150 IS and Panasonic ZS40. Canon ELPH 150 IS is clearly the smaller of the two cameras. Its body is 16mm narrower, 7mm shorter and 10mm thinner than Panasonic ZS40.
Comparison image of Canon ELPH 150 IS and Panasonic ZS40 Size, Weight and External Dimensions - Front View
Here is the back view size comparison of Canon ELPH 150 IS and Panasonic ZS40.
Comparison image of Canon ELPH 150 IS and Panasonic ZS40 Size and Weight - Back View
Now lets look at the top view comparison of Canon ELPH 150 IS and Panasonic ZS40.
Top View Comparison image of Canon ELPH 150 IS and Panasonic ZS40 Size
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon ELPH 150 IS is significantly lighter (98g ) than the Panasonic ZS40 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither Canon PowerShot ELPH 150 IS (IXUS 155) nor Panasonic Lumix DMC-ZS40 (Lumix DMC-TZ60) 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 ZS40's 3.00" LCD screen is slightly larger than Canon ELPH 150 IS's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.