Battery pack belt clip

A belt clip designed to fit an Anker external battery pack. (specifically, Anker 2nd Gen. Astro3 12000mAh External Battery: http://www.ianker.com/product/79AN7904-BA)

Designed in FreeCAD; should be modifiable using the sketch layers. However, I'm not terribly experienced with this software and may not have set up the file very well.