Denik Evelynn Blue Embroidered Notebook Pouch (5.1 x 16.5 x 1.3 cm)

I love this thing! Fits perfectly on my Hobonichi Cousin (that's an A5 notebook, for those out there who aren't Hobonichipilled) and holds four pens/highlighters. It's also very cute. Exactly what I needed, and I couldn't be happier with it.