This is what my setup looked like on my last trip to Japan on bicycle from Tokyo to Osaka.
I lived in a tent for almost the entire month and worked on visual stories for my website and youtube channel. Inside a blue backpack are 8 kg photo and video equipment:
GoPro 6 camera with batteries
Sony A37 with 3 fast primes: 24,50,100 and 1 zoom lens - 24-85 + microphones, batteries etc.
Most of the time I was shoot on Sony DSLR with 24-85, on GoPro and on phone. I liked the picture I brought, especially from DSLR, but it was hard to carry all the equipment all the time and sometimes I missed the shot. Missed frames - the main motive for system optimization.
While I have weak financial capabilities and must thinking inside old Minolta A system. Even if I sell all the lenses, I can earn around 1000 USD. I do not know if I can get something worthy for that amount of money without losing much in the quality of the video.