I found that the storage gui felt old and boring and so I made my own. If you click on Ender Chest it runs the /ec 1 command to open the first ender chest page. You can use the buttons that are built into it to go to over pages. The numbers correspond to backpacks. Clicking 1 does /bp 1. (Took a long time because it was supposed to look like firmaments where it is all the pages shown at once but I couldn’t do that)