Reddit mentions of TWSBI ECO Fountain Pen Black F Nib

I'd love to hear what other folks are using. Ideally, I'd like a case that can fit a total of 16-20 fountain pens, but hopefully with a smaller footprint. The 96-slot Global Art Leather Pencil Case is almost perfect... but they changed their design since I bought mine and they now have only one loop per slot instead of two. (I utilize both loops for smaller things, like pencil leads, wax stamps, etc.)

My current case contains the following items, but as you can see I'm just about out of room!

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Side A: Pencils

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1. rOtring 800 in .05
   
2. Uni Kuru Toga Pipe Slide in .05 with red nano dia lead
   
3. Uni Kuru Toga Pipe Slide in .05 with blue nano dia lead
   
4. Uni Kuru Toga Pipe Slide in .05 with green nano dia lead
   
5. Erasers: refills for the General Pencil Co. Factis BM-2 mechanical erasers, plus some for the Kuru Toga
   
6. A pair of General Pencil Co. Factis BM-2 mechanical erasers (a nice, thin eraser capable of area or detail erasing)
   
7. Extra red, green, and blue Uni nano dia lead
   
8. Extra black Uni nano dia lead (in a spare Pentel container)
   
9. Alumicolor 6" engineer pocket scale, standard (used as a straight edge)
   
10. Heavy-duty X-Acto Gripster knife
    
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    Side B: Fountain Pens
    
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11. Noodler's Neponset Ebonite Flex in black, filled with Noodler's Apache Sunset
    
12. TWSBI Eco in black, filled with Jacques Herbin 1670 Emerald of Chivor
    
13. Jinhao X750 in Black Night Sky, filled with Jacques Herbin 1670 Stormy Grey
    
14. Jinhao X750 in Lava Red, filled with Diamine Sherwood Green
    
15. Jinhao X750 in Black Frost Black, filled with Rohrer & Klingner Alt-Goldgrun
    
16. Jinhao X750 in Black Night Sky, filled with Noodler's Blue Ghost
    
17. An inexpensive atomizer (used for fine control when creating ink splatters)
    
18. Pilot Plumix, filled with Noodler's Firefly
    
19. Noodler's Charlie (not sold; comes free with 4.5 oz Noodler's inks), filled with Pilot Iroshizuku Yama-Budo

Welcome!

The TWSBI Eco is a great pen for its price. As for nib size, I'd start with a Fine or Extra Fine. I feel anything broader is too thick for writing on A5 papers and smaller. If you're used to ballpoints, those normally translate to Extra Fine.

You might find this video to be of interest.

The usual recs are the Pilot Metropolitan, Lamy Safari, and the TWSBI Eco.

That's a very good choice and a great pen. I would add a couple more to your list: 1, 2, 3, and on the more expensive side, 1 and 2.

But! If you just want to tread the waters, maybe look into this or this. They're both cheap so you're not far down cash if you don't like it. They're also both pens that I carry around with me everyday because I really like how they write.