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 Panasonic FH3 and Panasonic XS1 side-by-side from the front, back and top in their relative dimensions. Panasonic FH3 has external dimensions of 98 x 55 x 24 mm (3.86 x 2.17 x 0.94″) and weighs 165 g (0.36 lb / 5.82 oz) (including batteries). Panasonic XS1 has external dimensions of 94 x 54 x 14 mm (3.7 x 2.13 x 0.55″) and weighs 103 g (0.23 lb / 3.63 oz) (including batteries).
Below you can see the front-view size comparison of the Panasonic FH3 and the Panasonic XS1. Panasonic XS1 is clearly the smaller of the two cameras. Its body is 4mm narrower, 1mm shorter and 10mm thinner than Panasonic FH3.
Here is the back view size comparison of the Panasonic FH3 and Panasonic XS1.
Now lets look at the top view comparison of Panasonic FH3 and Panasonic XS1.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Panasonic XS1 is significantly lighter (62g ) than the Panasonic FH3 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Panasonic Lumix DMC-FH3 (Lumix DMC-FS11) nor Panasonic Lumix DMC-XS1 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
Panasonic FH3 and Panasonic XS1's LCD screens have the same diagonal size of 2.70 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.