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 Panasonic ZS1 and Panasonic ZS5 side-by-side from the front, back and top in their relative dimensions. Panasonic ZS1 has external dimensions of 103 x 60 x 33 mm (4.06 x 2.36 x 1.3″) and weighs 229 g (0.50 lb / 8.08 oz) (including batteries). Panasonic ZS5 has external dimensions of 103 x 60 x 32 mm (4.06 x 2.36 x 1.26″) and weighs 214 g (0.47 lb / 7.55 oz) (including batteries).
Below you can see the front view size comparison of Panasonic ZS1 and Panasonic ZS5. Panasonic ZS1 has the same height and width with Panasonic ZS5. On the other hand, with a thickness of 33mm, it is 1mm thicker.
Here is the back view size comparison of Panasonic ZS1 and Panasonic ZS5.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Panasonic ZS5 is 15g lighter than the Panasonic ZS1 but we don't think this will make a significant difference.
Unfortunately neither Panasonic Lumix DMC-ZS1 (Lumix DMC-TZ6) nor Panasonic Lumix DMC-ZS5 (Lumix DMC-TZ8) 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
Panasonic ZS1 and Panasonic ZS5's LCD screens has the same diagonal size of 2.7".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.