Protective case with internal suspension system

A protective case for a mobile electronic device can include a sliding back portion that permits quick and easy installation and removal of the mobile device. The protective case can include a chassis that resists bending or flexing during an impact event, thereby reducing stresses imparted to components of the mobile device housed in the protective case during the impact event. The protective case can include surface coverings to absorb and dissipate impact energy resulting from the impact event, thereby reducing impact forces transmitted to the mobile device. The protective case can include an internal suspension system configured to protect the electronic device from drop-induced damage and to preserve the resale value of an electronic device by minimizing cosmetic damage to external surfaces of the electronic device while housed in the case. In some examples, the protective case can be waterproof.