A holder apparatus comprises a strap assembly, a cradle assembly, and an arm assembly. The strap assembly includes a support plate component attachable to a belt component. The cradle assembly includes a device-securing structure and an adjustment mechanism. The arm assembly includes a flexible arm component and a clip component. A first end of the flexible arm component is selectively engageable with the clip component. A second end of the flexible arm component is selectively engageable with the cradle assembly.