LIHIT LAB's Hinemo Stand Pen Pouch can also, as the name suggests, be used as a standing pen stand. Just open the case and place it on the table. You can also turn the case inside out by opening and folding both parts all the way back, and then retracting the zipper. Even in this mode, it works standing up. Watch this film for clarification:
The case is made of hanpu cotton from Japanese Fuji Kinume.