I'm actually very happy with the cute mint green Rosyposy A6 notebook cover and pen case I scrounged off Ali Express, they're pretty good quality for something that's explicitly cutesy and aimed at teenage girls. But I'm considering asking for a Lochby or Galen Leather notebook zipper case for Christmas, something that's ultra-sturdy and can bang around in a bag for a decade, but alas they only come in Manly Colors.

I say this having worn a cute pink Hobonichi cover, which are quite good quality, to absolute tatters before.