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And then you have the C series. Mainly envelopes that are mean between A and B thus fitting the A reasonably inside.

Yes, but that is really rarely used -at least around here-. Most envelopes nowadays have opted for different factors. Usually you fold an A4 in thirds on the longer side and use an 110x220 envelope.

Nearly all letters I get are in C5 envelopes, i.e. A4 folded in half. But Denmark is so electronic that "nearly all" is about one a month.

Folding in thirds isn't worth the bother when I post things so infrequently.

Choosing a large British supermarket, they have C4, C5 and C6 sizes, plus DL (A4 in thirds) which are cheapest: https://www.tesco.com/groceries/en-GB/search?query=envelopes

Same in Switzerland. Almost all letters are A4 folded in half inside a C5 envelope.

> The dimensions of DL [size] are 110 x 220 mm (4⅓" x 8⅔") and as such the DL envelope will hold an A4 sheet of paper folded into 3 equal sections parallel to its shortest sides.

* https://www.papersizes.org/c-envelope-sizes.htm

* https://www.youtube.com/watch?v=DmBvP0KOZP0

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