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 Sony A390 and Sony A380 side-by-side from the front, back and top in their relative dimensions. Sony A390 has external dimensions of 128 x 97 x 86 mm (5.04 x 3.82 x 3.39″) and weighs 549 g (1.21 lb / 19.37 oz) (including batteries). Sony A380 has external dimensions of 128 x 97 x 71 mm (5.04 x 3.82 x 2.8″) and weighs 519 g (1.14 lb / 18.31 oz) (including batteries).
Below you can see the front view size comparison of Sony A390 and Sony A380. Sony A390 has the same height and width with Sony A380. On the other hand, with a thickness of 86mm, it is 15mm thicker.
Here is the back view size comparison of Sony A390 and Sony A380.
Now lets look at the top view comparison of Sony A390 and Sony A380.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Sony A380 is 30g lighter than the Sony A390 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 both Sony A390 and Sony A380 have the same Sony/Minolta Alpha lens mount and APS-C sized sensors, lenses will not be a differentiator on total size of the system.
Unfortunately neither Sony Alpha DSLR-A390 nor Sony Alpha DSLR-A380 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 DSLR Cameras with Weather Sealing
LCD Screen Size and Features
Sony A390 and Sony A380's LCD screens has the same diagonal size of 2.7".
Both cameras feature Tilting screens
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels.