I would go the MFT route as well.
A good and minuscule hiking setup would be a smallish body such as Pany GX80, Oly E-M10 mk II or Oly Pen-F and the following lenses:
If you want an even smaller kit, a Panasonic GM5 can be had for quite cheap and it's about the same size as the Sony RX100 while offering roughly the same IQ as the bodies above.
A good and minuscule hiking setup would be a smallish body such as Pany GX80, Oly E-M10 mk II or Oly Pen-F and the following lenses:
- UWA zoom (18-36 FF equiv): Oly 9-18
- Standard zoom (24-64 FF equiv): Pany 12-32
- Tele zoom (70-200 FF equiv): Pany 35-100)
If you want an even smaller kit, a Panasonic GM5 can be had for quite cheap and it's about the same size as the Sony RX100 while offering roughly the same IQ as the bodies above.