Thank you for checking my nif file. Ok so, I'll explain in steps what I did, because I already went over the weight painting and such. And I know there is some data missing. but the question really is: how do I get it in there? This is what I did: 1) I copied the meshes from a backpack mod and the barrel and placed them in a folder 2) I opened the backpack mesh in Outfit Studio, and I dragged the barrel mesh in there too and positioned it accordingly 3) I deleted the backpack mod mesh in Outfit Studio, leaving only the barrel mesh 4) I selected "NPC Spine2" from the bones and painted the barrel in a deep red to indicate heavy weight 5) I saved that as a nif But somehow there is skin data missing when I export it from outfit studio. Should I adapt a setting when I export? You mentioned I exported in a "non-Skyrim" format, how do I export in a Skyrim format? (Thanks a bunch for guiding me trough this and searching for a solution, because I know it can be hard to explain stuff to noob-level beginners, so thank you. :smile: ) EDIT: Ok, so I redid everything again like I described it in the steps. I also added "NPC Spine1" in addition to "NPC Spine2", both with weight paints. I admit I've been messing around with this for a while and the previous file may have been a failed test file. But here's a fresh one I just made: https://ufile.io/8cwamot1 Notice I just exported it as a .nif from Outfit Studio, and the "NiSkinData" is missing, so perhaps I'm exporting it wrongly?