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 Olympus E-M10 IV and Canon M5 side-by-side from the front, back and top in their relative dimensions. Olympus E-M10 IV has external dimensions of 122 x 84 x 49 mm (4.8 x 3.31 x 1.93″) and weighs 383 g (0.84 lb / 13.51 oz) (including batteries). Canon M5 has external dimensions of 116 x 89 x 61 mm (4.57 x 3.5 x 2.4″) and weighs 427 g (0.94 lb / 15.06 oz) (including batteries).
Below you can see the front view size comparison of Olympus E-M10 IV and Canon M5. Olympus E-M10 IV is 5mm shorter and 12mm thinner than Canon M5 but it is also 6mm wider.
Here is the back view size comparison of Olympus E-M10 IV and Canon M5.
Now lets look at the top view comparison of Olympus E-M10 IV and Canon M5.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Olympus E-M10 IV is 44g lighter than the Canon M5 but we don't think this will make a significant difference.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you have to also take into account the lenses that you will be using with these bodies. Since Canon M5 has an APS-C sized sensor and Olympus E-M10 IV has a smaller Four Thirds sensor, Olympus E-M10 IV's lenses for a similar focal length and aperture will generally be lighter and smaller than the Canon M5 lenses.
Unfortunately neither Olympus OM-D E-M10 IV nor Canon EOS M5 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
LCD Screen Size and Features
Canon M5's 3.2" LCD screen is slightly larger than Olympus E-M10 IV's 3" screen.