PSA: I've not seen this discussed, but the Hario Switch 03 takes 02 size papers and caps out around 20/300 for full immersion brew capacity : r/pourover
HARIO SWITCH ⋅ Dripper de inmersión | OnlineShop
V60 Immersion Dripper "Switch" 03 Size – HARIO Europe
Hario Switch Review : Hype or have they mastered immersion brewing?
Hario Switch Pour Over Recipe | Same Great Clarity, More Sweetness – Kaldi's Coffee