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 FujiFilm S2800HD and Pentax VS20 side-by-side from the front, back and top in their relative dimensions. FujiFilm S2800HD has external dimensions of 110 x 74 x 82 mm (4.33 x 2.91 x 3.23″) and weighs 437 g (0.96 lb / 15.41 oz) (including batteries). Pentax VS20 has external dimensions of 111 x 61 x 38 mm (4.37 x 2.4 x 1.5″) and weighs 235 g (0.52 lb / 8.29 oz) (including batteries).
Below you can see the front view size comparison of FujiFilm S2800HD and Pentax VS20. Pentax VS20 is 13mm shorter and 44mm thinner than FujiFilm S2800HD but it is also 1mm wider.
Here is the back view size comparison of FujiFilm S2800HD and Pentax VS20.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Pentax VS20 is significantly lighter (202g ) than the FujiFilm S2800HD which may become a big advantage especially on long walking trips.
Unfortunately neither FujiFilm FinePix S2800HD (FinePix S2900HD) nor Pentax Optio VS20 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 Bridge Cameras with Weather Sealing Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
FujiFilm S2800HD and Pentax VS20'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.