ZIPIT: Lenny Pencil Case - Black & White - Large Storage Capacity Zipper Pouch, Makeup & Stationery Bag, School, Washable Polyester, Kids-Teens-Adults

This ended up being perfect for me! I needed something small but roomy to hold my pens and pencils. I tend to work in different spaces throughout the day and like how easily I can zip this up and go. The fact that it folds open to create more of a stable open space, rather than soft cases that just kind of fold in and make it difficult to see and grab things easily, is a really unique feature and a huge plus in my book. I can't speak to how well it works in a binder, I feel it might be a bit bulky for that, but for my purposes it's amazing. Highly recommend.