An elegant Apple-like way to keep your Apple Pencil close to your iPad Pro (12.9 and 9.7-inch)
Keep in mind that the fitting is tight. The Apple Pencil does not slip through the holder because it is slightly thicker on the top. So always put the pen in the holder with the point first. With the head first, it will get stuck!
You just need 4 cm of double-sided tape to connect it to your iPad Pro. Or stronger: use Sugru, the amazing moldable glue that works on many different materials and comes in different colors (sugru.com). This glues even when you have a silicone cover around your iPad.