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 Panasonic G7 and Canon 170 IS side-by-side from the front, back and top in their relative dimensions. Panasonic G7 has external dimensions of 125 x 86 x 77 mm (4.92 x 3.39 x 3.03″) and weighs 410 g (0.90 lb / 14.46 oz) (including batteries). Canon 170 IS has external dimensions of 100 x 58 x 23 mm (3.94 x 2.28 x 0.91″) and weighs 141 g (0.31 lb / 4.97 oz) (including batteries).
Below you can see the front view size comparison of Panasonic G7 and Canon 170 IS. Canon 170 IS is clearly the smaller of the two cameras. Its body is 25mm narrower, 28mm shorter and 54mm thinner than Panasonic G7. As you can tell, actually this is not a fair size comparison since Canon 170 IS has a built-in lens but Panasonic G7 doesn't. Once you put a lens on G7, its thickness will increase significantly.
Here is the back view size comparison of Panasonic G7 and Canon 170 IS.
Now lets look at the top view comparison of Panasonic G7 and Canon 170 IS.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon 170 IS is significantly lighter (269g ) than the Panasonic G7 which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on G7, the total kit will weigh much higher.
Unfortunately neither Panasonic Lumix DMC-G7 nor Canon PowerShot ELPH 170 IS (IXUS 170) 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 Mirrorless Cameras with Weather Sealing Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Panasonic G7's 3" LCD screen is slightly larger than Canon 170 IS's 2.7" screen.
Moreover, Panasonic G7 sports a Fully Articulated screen
which you can change the angle and position of the screen almost freely, making it possible to shoot from waist or over the head levels, and especially very useful for shooting selfies and video. On the other hand, Canon 170 IS has a fixed type screen which provides almost no flexibility in shooting positions compared to G7.