I picked up all the Nock cases from the original Kickstarter that launched the product line. I use the Hightower most often along with a Rhodia notepad that fits right in - all Nock cases fit even fairly large pens like the TWSBI VAC 700. I'd love to see the the Saki rollups on a drop though - they are reminiscent of the pen sleeves that come with Nakaya pens.