Ask TGS: Are Leather or Fabric Pen Cases "Better" for your Pens?

Four cases I’m currently using, in a mix of leather and fabric, clockwise from top left: Craft Design Technology Pen Pouch , Soolla Studio Pouch , Nagasawa Kip Leather 10-Pen Folio , and a Rickshaw Fillmore . Though it initially struck me as a somewhat odd question, I get asked from time to time what pen case material is “safer” for your pens. There are two main options in today’s market - leather…