If you are doing fountain pens (which I highly recommend!) then leuchtturm is the only way to go, every since moleskin downgraded their paper quality!

leuchtturm has every feature of moleskin and costs less and better paper quality.

I've been using the Moleskine Cahier XL for 3 or 4 years now, and I love them. Soft cover is flexible for folding back, they're lightweight, a comfortable size for carrying with my laptop, and hold up well. Each book is roughly 8 months of working life.

I don't use page numbers though - I do date every single entry.

https://us.moleskine.com/en/cahier-journal-brown/p0408

Those look awesome, mostly I've used the ones from Eureka Lab Book[1] which seem similar, although I'm a big fan of mixed graph paper and lined. Which paper rule do you use from Leuchtturm1917?

[1] https://www.eurekalabbook.com/lab-engineering-notebooks/

Dotted. Even better than graph paper if you draw a lot of diagrams/figures, in my opinion.

I use Fabriano dotted saddle-stitch as a cheaper and lighter alternative to the Leuchtturm1917, for instance when I'm traveling or at a conference. The paper holds up to any non-calligraphic fountain pen I use.

I'm using one from Fiorentina, it's hardbound with a dragon and a griffin on the cover, I've been using them for a while now. They are really well made, but I mostly like them for the cover :)

To save the next person 30 seconds of googling around: http://www.fiorentinaltd.com/index.php?option=com_virtuemart...

I like it. I'll still stick with my Leuchtturm :)

That's not it, but I like that one too. That's the right brand though.

It's this one:

https://www.barnesandnoble.com/w/home-gift-patina-brown-drag...

Came here to say this. The included spine and cover labels are a nice touch.