So, I like to write simple notes, journaling, to-do lists, or essays/fiction with a fountain pen whenever possible, and I'm trying to find a good journal or planner to use. My Pilot and Diamine inks feather a lot on the paper I'm currently using, and that's really the main problem I want to address.
What brands or products would you recommend? What kind of paper do you like best?
Midori MD pads with one of their covers work well and aren't too expensive. Available in A5 and A6 if I recall. Otherwise as already mentioned I like the 90gsm Rhodia or Clairefontaine notebooks. The 80gsm Rhodia paper (found in a lot of their pads) always feels like the backside of the paper has less coating on it and not as enjoyable.
I use a Hobonichi techo planner and grid notebooks. I also use Midori grid notebooks. No feathering on both, not too glossy so my nib doesn't "skate" on top. I like Rhodia pads (some of the notebooks feather). Clairfontaine is lovely smooth paper but my pens usually "skate" on it and I can't control my handwriting on it, but YMMV.
I like my Hobonichi Techo planner. The paper is thin, so it ghosts a bit, but it doesn’t bleed. I think they also make plain journals, and it’s not uncommon for Hobonichi fans to buy an extra planner to use as a journal.
@kalanggam As others have said, the Hobonichi's are great with fountain pens, or if it's more of a pure journal you're after the Luechtturm1917 Bullet Journal performs excellently.
My favorite notebook is the JetPens Kanso Noto. They have 160 sheets (320 pages) of Tomoe River paper with a 5mm dot grid. Tomoe River paper is a premium fountain pen friendly paper that should solve your feathering problems.
JetPens offers free shipping in the US for order of $35 or more. I don't know what options are available outside of the US.
The notebook is currently out of stock. I expect more to be back soon. Tomoe River paper was sold from one paper company to another. I think JetPens just cleared out their stock with paper from the original company and I anticipate they'll bring the notebook back soon with paper from the new company (Sanzen). In the past, the notebooks sold for $19.50, which is a great price for a premium paper notebook (seriously, I think only the Nanami Seven Seas notebooks have a better price per page for premium paper) . However, to keep the price low, the notebook doesn't have bells and whistles like an elastic closure or page marker ribbons.