I have the gx9 and it’s great for me as you can get very small zoom and prime lenses. Carried the gx9 and three prime lenses recently to Cyprus and Portugal in a bum bag (fanny pack). If you want even smaller, there’s a secondhand GM1 or GM5 with a tiny zoom. See both pictured with cup of coffee for scale. I also have the G9, which is ergonomically superior, but bigger, but still relatively small compared with full frame once you factor in the smaller lenses.
