[header] How to wear a shoulder holster [title] Put the empty holster rig on. [step] Leave the cargo out of the rig until you get it tightened properly. Slip each of your arms through the arm loops like you would a backpack. 
Make sure the crossed straps go in the back, and that the gun and magazine holsters are below your arms. [substeps] Put one arm into its loop and slide the strap all the way to the top.