I prefer the binders with the loose leaf paper.
My last office I had 2 walls (8×12) with books floor to ceiling with field books going back to 1947. I'm sure they are in a landfill by now.
I use binders with loose leaf paper and keep them in the manila file folder with everything for each project
When I have connected many boundary surveys into a network the files are moved into a plastic file folder named PROJECT XTB.
HAve about a dozen of those networks.
I have one (1) field book, the same one I had when I started my business in 2000. Some of the pages have notes, all from level runs.