Thanks to @olyclimber for creating a safe space for a photo nerd like me.....
If you're here, you probably care about your photos. Or maybe you are just here to make fun of people that carry too much weight!
But, regardless, what is your photo system and why?
For me, it is a full frame dSLR (nikon D750), mostly because the mirrorless options weren't quite there yet when I bought my latest camera. Why full frame?? That is a very good question....but I am just a sucker for a nice image and a 35mm sensor seems to do that and still be something you can carry up a mountain.
My main lens is a Nikon 24-120mm f4 that is OK, but not great. I sometimes lug a 70-300mm tele that is f3.5-5.6ish. Nothing fancy since the finance minister (and my kids) won't let be spring for f2.8 glass or better. My one splurge is a 20mm f1.8 that I bought used for astrophotraphy. I hang a Lowepro case on my chest to carry the camera, supported by p-cord and biners off the pack straps.
For more technical routes (~>5.5ish) I have a Canon S120 on my shoulder strap.
Now, I would probably spring for a Canon R5 or Nikon Z7 for a dSLR and a Sony RX100 for a P&S.... Maybe in a few years.....
The nerd on the summit of Mt. Anderson earlier this summer....