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 Pentax WG-1 GPS and Canon 100D side-by-side from the front, back and top in their relative dimensions. Pentax WG-1 GPS has external dimensions of 116 x 59 x 29 mm (4.55 x 2.3 x 1.12″) and weighs 167 g (0.37 lb / 5.89 oz) (including batteries). Canon 100D has external dimensions of 117 x 91 x 69 mm (4.61 x 3.58 x 2.72″) and weighs 407 g (0.90 lb / 14.36 oz) (including batteries).
Below you can see the front-view size comparison of the Pentax WG-1 GPS and the Canon 100D. Pentax WG-1 GPS is clearly the smaller of the two cameras. Its body is 1mm narrower, 32mm shorter and 40mm thinner than Canon 100D. As you can tell, actually this is not a fair size comparison since Pentax WG-1 GPS has a built-in lens but Canon 100D doesn't. Once you put a lens on 100D, its thickness will increase significantly.
Here is the back view size comparison of the Pentax WG-1 GPS and Canon 100D.
Now lets look at the top view comparison of Pentax WG-1 GPS and Canon 100D.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Pentax WG-1 GPS is significantly lighter (240g ) than the Canon 100D 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 100D, the total kit will weigh much higher.
Weather Sealing
Thanks to the weather-sealed body of the WG-1 GPS, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the 100D.
LCD Screen Size and Features
Canon 100D's 3.00" LCD screen is slightly larger than Pentax WG-1 GPS's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.