Clairefontaine A4 Hardcover Notebooks (90gsm) would definitely be an option and are widely available in many countries.
This paper is my favorite writing paper, high quality, smooth and most inks perform well on it.
You can definitely write on both sides, no bleed through, most of the times (depending also on the ink) very little show through.
https://www.clairefontaine.com/produ...6sh-plain.html
https://www.amazon.de/Clairefontaine...rdcover&sr=8-7
Sometimes people recommend Leuchtturm Notebooks, I tried one ones, it was just unusable for FP usage even it was advertised for FP usage.
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