In reference to an older post:
"Mega
Hello, I am starting new dedicated server using your mod. We are using Authentic Z - Current version. And we have problem with textures on backpack specifically item ID "schoolbag_spiffo2". We tried to delete your mod and download it again, verify integrity on our clients, doing wipe and nothing helped. So last idea was to ask you if you could help.
Thanks"

I am experiencing the same issue in my single player save. I found the exact same item ID "schoolbag_spiffo2" displaying with no textures. When checking the workshop folder there is only a .png texture under the item ID. All other bags that were tested and working have their respective .xml files. I tried the same thing, uninstalling and verifying the integrity of the game and each time the .png of spiffo2 would appear but with no .xml file.