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 340 HS and Canon ELPH 180 side-by-side from the front, back and top in their relative dimensions. Canon ELPH 340 HS has external dimensions of 100 x 58 x 22 mm (3.93 x 2.27 x 0.88″) and weighs 147 g (0.32 lb / 5.19 oz) (including batteries). Canon ELPH 180 has external dimensions of 95 x 54 x 22 mm (3.74 x 2.13 x 0.87″) and weighs 126 g (0.28 lb / 4.44 oz) (including batteries).
Below you can see the front-view size comparison of the Canon ELPH 340 HS and the Canon ELPH 180. Canon ELPH 180 is 5mm narrower and 4mm shorter than Canon ELPH 340 HS but they have the same thickness of 22mm.
Here is the back view size comparison of the Canon ELPH 340 HS and Canon ELPH 180.
Now lets look at the top view comparison of Canon ELPH 340 HS and Canon ELPH 180.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon ELPH 180 is significantly lighter (21g ) than the Canon ELPH 340 HS which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Canon PowerShot ELPH 340 HS (IXUS 265 HS) nor Canon PowerShot ELPH 180 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 ELPH 340 HS's 3.00" LCD screen is slightly larger than Canon ELPH 180's 2.7 screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.