A housing for receiving and securing storage devices of varying dimensions useful in automated library systems is provided. In one example, the housing has an interior space defined by a base and a perimeter wall extending along at least two sides of the base. A first arm is coupled to the perimeter wall, and at least a portion of the first arm is biased to extend into the interior space at a height above the base for allowing insertion of thinner storage devices without pushing on the arm. The first arm is configured to evacuate the interior space in response to a thicker storage device pushing on the first arm. Stand-offs or other length differentiating features may be disposed and sized to provide a common pick point among storage devices of different types insertable in the housing. Further examples include providing additional arms that may be configured similar to the first arm.