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 Canon SX170 IS and Canon SX160 IS side-by-side from the front, back and top in their relative dimensions. Canon SX170 IS has external dimensions of 108 x 71 x 44 mm (4.25 x 2.8 x 1.73″) and weighs 251 g (0.55 lb / 8.85 oz) (including batteries). Canon SX160 IS has external dimensions of 111 x 73 x 44 mm (4.37 x 2.87 x 1.73″) and weighs 291 g (0.64 lb / 10.26 oz) (including batteries).
Below you can see the front view size comparison of Canon SX170 IS and Canon SX160 IS.
Now lets look at the top view comparison of Canon SX170 IS and Canon SX160 IS.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon SX170 IS is 40g lighter than the Canon SX160 IS but we don't think this will make a significant difference.
Unfortunately neither Canon PowerShot SX170 IS nor Canon PowerShot SX160 IS 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 Compact Cameras with Weather Sealing
LCD Screen Size and Features
Canon SX170 IS and Canon SX160 IS's LCD screens has the same diagonal size of 3".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.