A waterproof protective case (100, 800, 850, 900) for a personal electronic device, the protective case (100, 800, 850, 900) comprising: a front portion comprising a front side surface, a left side surface, a right side surface, a top side surface, and a bottom side surface, a cavity configured to receive the personal electronic device, the cavity defined by an inner front side surface, an inner left side surface, an inner right side surface, an inner top side surface, and an inner bottom side surface, a mating surface extending around a perimeter of the cavity, a back portion configured to attach to the front portion to encapsulate the personal electronic device when the personal electronic device is installed in the protective case (100, 800, 850, 900), the back portion comprising an inner back surface and an outer back surface, wherein the inner back surface comprises a gasket (240, 855, 905) extending around the perimeter of the inner back surface, the gasket (240, 855, 905) comprising a flexible sealing surface configured to provide a liquid-tight seal between the mating surface of the front portion and the flexible sealing surface when the back portion is attached to the front portion, characterized by the front portion comprising a top side clasping feature extending from the top side surface, the top side clasping feature oriented at an angle of approximately 45 degrees inward with respect to a first plane that is coplanar with the top side surface, and a bottom side clasping feature extending from the bottom side surface, the bottom side clasping feature oriented at an angle of approximately 45 degrees inward with respect to a second plane that is coplanar with the bottom side surface; and the back portion comprising a first clasping surface configured to engage the top side clasping feature on the front portion, the first clasping surface being oriented at an angle of approximately 45 degrees inward with respect to the first plane when the front portion is attached to the back portion, and a second clasping surface configured to engage the bottom side clasping feature on the front portion, the second clasping surface being oriented at an angle of approximately 45 degrees inward with respect to the second plane when the front portion is attached to the back portion. a front portion comprising a front side surface, a left side surface, a right side surface, a top side surface, and a bottom side surface, a cavity configured to receive the personal electronic device, the cavity defined by an inner front side surface, an inner left side surface, an inner right side surface, an inner top side surface, and an inner bottom side surface, a mating surface extending around a perimeter of the cavity, a back portion configured to attach to the front portion to encapsulate the personal electronic device when the personal electronic device is installed in the protective case (100, 800, 850, 900), the back portion comprising an inner back surface and an outer back surface, wherein the inner back surface comprises a gasket (240, 855, 905) extending around the perimeter of the inner back surface, the gasket (240, 855, 905) comprising a flexible sealing surface configured to provide a liquid-tight seal between the mating surface of the front portion and the flexible sealing surface when the back portion is attached to the front portion, characterized by the front portion comprising a top side clasping feature extending from the top side surface, the top side clasping feature oriented at an angle of approximately 45 degrees inward with respect to a first plane that is coplanar with the top side surface, and a bottom side clasping feature extending from the bottom side surface, the bottom side clasping feature oriented at an angle of approximately 45 degrees inward with respect to a second plane that is coplanar with the bottom side surface; and the back portion comprising a first clasping surface configured to engage the top side clasping feature on the front portion, the first clasping surface being oriented at an angle of approximately 45 degrees inward with respect to the first plane when the front portion is attached to the back portion, and a second clasping surface configured to engage the bottom side clasping feature on the front portion, the second clasping surface being oriented at an angle of approximately 45 degrees inward with respect to the second plane when the front portion is attached to the back portion.