A carrying case assembly for portable electronic devices includes a carrying case that has: an exterior casing that creates a compartment for receiving a portable electronic device; means for securing the portable electronic device within the compartment; and a first component of an interlocking mechanism attached to a surface of the exterior casing and utilized to hang the carrying case on a user wearable strap configured with a second component of the interlocking mechanism. The assembly further includes a holding latch having: (i) a first connecting section that securely attaches the holding latch to the user wearable strap; and (ii) a second connecting section serving as the second component of the interlocking mechanism, which receives the first component attached to the surface of the carrying case and enables the carrying case to be fixably and removably attached to the user wearable device via the holding latch.