The Roterfaden Chart List
So you don't mix up your sizes.
Roterfaden's sizing has a way of needling you. The S matches A6. B6 comes in at 12.5 x 17.5 cm, or 4.9 x 6.9 inches. The M is A5. The L is A4. Then the XL shows up, because plain A4 apparently wasn't enough, so you get A4 with a little extra breathing room.
And then you hit the real headache: What size is the Roterfaden SO_22 cover? That's the one that makes you squint and wonder why standard paper sizes ever bothered showing up in the first place.
If your brain likes clean systems, this can feel mildly criminal. International size standards already exist, and yet here you are, sorting through custom names and odd fits like you're decoding a note left under a rain-soaked door. Still, once you see Roterfaden's size chart, the fog lifts and the whole thing starts to make... <cough> sense. </cough>
