You asked

Is the panasonic lumix g 100 300mm f 4 5 6 ii good for travel?

Here is what the site says about that.

From Panasonic Lumix G 100-300mm f/4-5.6 II: Panasonic Lumix G 100-300mm f/4-5.6 II: A zoom lens by Panasonic for Micro Four Thirds cameras, 100-300mm f/4-5.6. Specs - Maker: Panasonic - Focal length: 100-300mm (zoom) - Maximum aperture: f/4-5.6 (it gets darker as you zoom in) - Made for: Micro Four Thirds sensors - Mounts: Micro Four Thirds - Stabilised: yes - Autofocus: yes What it frames like - On Micro Four Thirds (Micro Four Thirds): like 200-600mm on full frame; f/4-5.6 gives about ...

From Wildlife and sport: My picks: - Starting out: an APS-C mirrorless body with a 100-400mm-class zoom. The best value reach there is. - Hiking and travel wildlife: Micro Four Thirds with a 100-400mm. Light, long and stabilised. - Serious sport and birds: a full-frame body with fast readout and a 200-600mm or 150-600mm zoom. Buy used: long lenses hold their value and change hands a lot, and the savings are large. See buying used.

Quoted from this site's pages.

From these pages