Because of the magnets. It's not super strong so probably wouldn't stay attached in a briefcase or backpack. But when I'm not traveling that's where my Pencil stays when I'm not using my iPad. Also when I'm quick charging the pencil I stick the cap near one of the magnets and that's where it stays until the Pencil is done charging. ![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)