@frittenfett I use a Namisu Nova along with a Spoke Roady ballpoint on mine. They're attached to the inside front & back covers with those little square stickers with elastic loops on them to keep them secure. I tried a lot of pocket pens and the Nova has been perfect for this. Super easy to quickly pop it out for quick notes, seals well, & a #6 Bock nib. The knurling is very grippy, too.