I Introduce to you the Microsoft Surface Gridfinity pen case. The case fits snugly around you're pen so it doesn't wobble around. I'ts secured in place with 2 6x2 magnets placed where the magnets inside the pen are. So the pen doesn't fall out even if you shake it upside down. The lid is held in place with 4 other 6x2 magnets. You can choose between a stackable Gridfinity lid or a non stackable one with the microsoft logo on it (or without logo).

Also Includes a standard no gridfinity version.