This is a simple clip for hanging glasses from backpack shoulder straps. It's similar to many others except that this one will fit backpacks with slim shoulder straps (like my Patagonia backpack). The clip has 10mm wide notches to help keep the clip secured to the strap.
The Fusion file is included in case your straps are different or you want to make other changes.
The author marked this model as their own original creation.