Abstract: A carrying case system comprising: a wallet-sized carrying case for holding personal items, the wallet-sized carrying case comprising: a substantially rigid front panel comprising a four-sided planar body and an upstanding rim extending along three sides of the four-sided planar body;a substantially rigid rear panel comprising a four-sided planar body and an upstanding rim extending along three sides of the four-sided planar body; and a lid; wherein the front panel is hingedly connected to the rear panel such that their respective rims can be brought into engagement with one another so as to form an enclosure with an open face; and wherein the lid is hingedly connected to the rear panel such that the lid can be brought into engagement with the front panel so as to close off the open face of the enclosure.