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Decathlon does little pocketable bags.
https://www.decathlon.co.uk/p/foldable-backpack-10l-travel/_/R-p-309861
But agree with @pacef8 the Albion UL musettes are lovely.
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For really tiny I've found these surprisingly good. Pretty tough for what I expected to be something really flimsy
https://nanobag.com/en-int/products/nanobag-euI also have a Rapha packable backpack which is great (after I had the stitching reinforced) but now discontinued.
Looking for a v small packable rucksack/ musette to carry when out on weekend rides. Really after something that packs down super small. Any recommendations?