For personal notes, I’ve been using Zequenz notebooks for a few years (I used to have Moleskines before) and I really like them. They’re typically thicker than things like Field Notes, but their main strength is that they can be bent as much as you want without damaging the cover or the binding. They use a custom circular binding method that works really well, I never had any issue with them (and I usually have the notebooks in a bag with me). They also give a nice little magnetic bookmark thing with each notebook that is surprisingly convenient.
I recently bought an A6 sized one (9*14cm), same size as a Field Notes but 256 pages so much thicker. I’d actually prefer 100-128 pages but this one works for me,
[Edit : this one is btw cheaper for me than a set of 3 Field Notes]
At work I use bigger notebooks with “soft rings”, i.e. flexible plastic instead of metal, and they’re really nice to use. I typically need bigger notebooks for work so these work perfectly.
And I used to have nice-ish pens (Rotring, Schaeffer, etc) but I now only use Pilot Frixion pens. I have one in my bag, one on my desk at work and one on my desk at home. They use a special ink that becomes invisible when heated enough, which is what happens when you use the “eraser” tip of the pen on it, so you get erasable notes without any of the problems of actually erasable ink. The 0.5mm are perfect for me.