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 V60 03 Paper Filters
Which Hario V60 Is Best? Plastic vs Ceramic, Size 01 vs 02 - Pourover Project
V60 Paper Filter 01 White 100 sheets (Box) - Hario Australia
Hario V60 Pour Over Kit | Coffea Coffee
Hario V60 Glass Coffee Dripper Black - Size 03 — Hario UK
Hario V60 Filter Papers 03 - White (100 Pack Bag) – hamlet