From RELOAD. Velcro closure and vertical loop. Simple! Available online.

We’ve redesigned our celly holders! Now sized to fit most Android phones, as well as iPhones and most cases. Our cell phone holder is made from 1000D CORDURA® and measures 5”H x 3.5”W. Attaches to the main strap of your bag with Velcro® closure, or you can slide a belt through the vertical loops.

Via Prolly.