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 150 IS and Panasonic ZS30 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 ZS30 has external dimensions of 105 x 59 x 28 mm (4.13 x 2.32 x 1.1″) and weighs 198 g (0.44 lb / 6.98 oz) (including batteries).
Below you can see the front-view size comparison of the Canon ELPH 150 IS and the Panasonic ZS30. Canon ELPH 150 IS is clearly the smaller of the two cameras. Its body is 10mm narrower, 2mm shorter and 4mm thinner than Panasonic ZS30.
Here is the back view size comparison of the Canon ELPH 150 IS and Panasonic ZS30.
Now lets look at the top view comparison of Canon ELPH 150 IS and Panasonic ZS30.
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 (56g ) than the Panasonic ZS30 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Canon PowerShot ELPH 150 IS (IXUS 155) nor Panasonic Lumix DMC-ZS30 (Lumix DMC-TZ40) 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
Panasonic ZS30'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.