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 Olympus SZ-30MR and Panasonic ZS70 side-by-side from the front, back and top in their relative dimensions. Olympus SZ-30MR has external dimensions of 106 x 69 x 40 mm (4.17 x 2.72 x 1.57″) and weighs 226 g (0.50 lb / 7.97 oz) (including batteries). Panasonic ZS70 has external dimensions of 112 x 67 x 41 mm (4.41 x 2.64 x 1.61″) and weighs 322 g (0.71 lb / 11.36 oz) (including batteries).
Below you can see the front view size comparison of Olympus SZ-30MR and Panasonic ZS70. Olympus SZ-30MR is 6mm narrower and 1mm thinner than Panasonic ZS70 but it is also 2mm taller.
Now lets look at the top view comparison of Olympus SZ-30MR and Panasonic ZS70.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Olympus SZ-30MR is significantly lighter (96g ) than the Panasonic ZS70 which may become a big advantage especially on long walking trips.
Unfortunately neither Olympus SZ-30MR nor Panasonic Lumix DMC-ZS70 (Lumix DC-TZ90) 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
Olympus SZ-30MR and Panasonic ZS70's LCD screens has the same diagonal size of 3.00".
On the other hand, Panasonic ZS70 features a Tilting screen
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels whereas the Olympus SZ-30MR has a fixed type screen which provides less flexibility in shooting positions compared to ZS70.