An endoscope sheath comprising: (a) a tube configured to receive all or a portion of a shaft of an endoscope, the endoscope including a light post in a proximal end region of the endoscope; and (b) an arm attached to and extending from a proximal end region of the sheath; wherein the arm has one or more features that are in communication with the light post to orient the sheath axially and rotationally with respect to the endoscope.